Hey there! This is a pretty cool foundation for a Mega-Gardevoir team. I think you've got the right idea so far with Breloom and Landorus-Therian as partners to Mega Gardevoir. These two break down pokemon that check Mega Gardevoir, which helps Mega Gardevoir sweep teams late game. The big problem with this team is that your other pokemon compound weaknesses that the three aforementioned pokemon already had, namely setup sweepers such as Mega Altaria and Mega Scizor. This makes it a lot harder to sweep teams with Mega Gardevoir or break down teams with Breloom. I think that these changes will help the team fare a lot better versus those setup sweepers while still dealing with the pokemon that Chansey and Metagross checked.
For starters, you have no hazard setters on this team which is something that almost every team has and should have. Chansey can learn Stealth Rock, but I plan on replacing this pokemon, so I'll use a different hazard setter. As I mentioned in the beginning, the team has a problem with compounded weaknesses that aren't being addressed. For example, Metagross, while having a good function for this team as a fairy check, stacks up weaknesses to Mega Charizard Y and Mega Scizor. In order to add a hazard setter and alleviate your weaknesses to these pokemon, while at the same time keeping your fairy check, I suggest replacing Metagross with Heatran.
Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 188 SpD / 68 Spe
Calm Nature
- Lava Plume
- Toxic
- Protect
- Stealth Rock
Heatran can switch into any of Mega Scizor's attacks bar Superpower (although it can live a Superpower if it hasn't been damaged too much and can outspeed and OHKO any Mega Scizor since most of them aren't EVed to outspeed this set) and any of Mega Charizard Y's attacks bar Focus Blast. Additionally, Heatran can take out Skarmory, which nothing on the original team could beat aside from the Charizard X you had in some of your replays.
The second issue I see with this team is the use of Chansey. Chansey is a pokemon that should almost never be run on offensive teams such as this one. Offensive teams rely a lot on momentum to have the upper hand against other teams because they don't run as much of a defensive backbone to counter hard-hitting wallbreakers and set-up sweepers. Chansey has no offensive capability, and therefore kills any momentum a team has, allowing for opponents to have relatively free switch-ins to their wallbreakers and set-up sweepers, which the team struggles with depending on the pokemon in question. Your strategy of toxic stalling teams until the opponent forfeits doesn't work against good teams and/or good players. For example, anything that uses Substitute as a regular move such as Mega Heracross and SubCM Keldeo can come in on anything that's not Toxic, use Substitute then use Close Combat and Secret Sword respectively without fear of taking damage. Additionally, after you either lose Chansey or switch something else in, these pokemon can fire off an attack under the protection of their substitute. Furthermore, Chansey is completely shut down by any Taunt user which forces you to switch out of Chansey, giving the opponent a free turn to hit something on the switch, set up hazards, use a stat-boosting move, etc. In the case of this team, Chansey isn't countering anything on its own that a different pokemon can't deal with. This different pokemon would be Clefable. Because of all of this, I suggest replacing Chansey with Clefable.
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 172 Def / 84 SpD
Calm Nature
- Calm Mind
- Moonblast
- Soft-Boiled
- Thunder Wave
Clefable still checks specially attacking water types such as Manaphy, Starmie, and Slowbro that Chansey checked. In addition, Clefable checks pokemon that Chansey doesn't check such as defensive Landorus-Therian and Weavile. Additionally, Clefable eases the matchups versus stall by setting up with Calm Mind. Using Calm Mind Clefable also gives the team an additional win condition outside of sweeping with Mega Gardevoir or Breloom.
Looking at the team after the changes, the team doesn't have a hazard removal, which I don't really like on this team since it leans more towards bulky offensive than hyper offensive. Bulky offensive teams have to switch out more often as opposed to sacking certain pokemon, which hyper offensive teams are more known for. Bulky offensive teams also don't win games as fast since there aren't as many hard-hitting sweepers/wallbreakers compared to hyper offensive teams. This means that hazards can wear down bulky offensive teams a lot over the course of the match, potentially leaving an opening for something on the opposing team to sweep. The team also doesn't have a reliable switch-in to Keldeo and Earth Power Heatran. To remedy all this, I suggest adding Latios as your final pokemon.
Latios @ Life Orb
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- Psyshock
- Roost
- Defog
I chose to use the set with Roost and Defog on it because this is the only team's switch-in to Keldeo and Heatran. With potential Scald and Lava Plume burns plus damage being taken each time Latios switches in on these two pokemon (in addition to potential other pokemon such as Electric types), Latios can get worn down pretty quickly. If Latios isn't able to recover HP, it can go down fairly quickly depending on how many times it has to switch in and whether or not it's been burned. Additionally, most of Latios' coverage moves that typically go over Roost, such as Hidden Power Fire and Earthquake, aren't necessary because the team already has good coverage for the pokemon that those moves hit.
Finally, I'll suggest changes for the sets you're running on the other three pokemon that have been unchanged in order to make them more optimal for this team. I second some of sumwun's changes such as changing the Gardevoir and Landorus-Therian spread.
Adding onto what sumwun said about the Landorus-Therian spread, running Earthquake and Earth Power is really redundant because neither of those two moves hit anything much harder than the other. As sumwun said, you should replace Earth Power with Stone Edge in order to have coverage against pokemon such as Talonflame and Tornadus-Therian. Additionally, running Superpower isn't necessary on this team because the team already has good coverage on the pokemon it hits, which would be Ferrothorn and pokemon that can run Air Balloon such as Excadrill and Heatran among a few others. Instead, I would replace Superpower with Knock Off since you don't have anything else that runs it and removing a pokemon's item such as a Choice item and Leftovers can be very beneficial.
Defensive Calm Mind Mega Gardevoir isn't a very good set for the reason that sumwun mentioned, which would be that it has very poor defenses so it's not as bulky as other defensive Calm Mind users. While Calm Mind is a usable move on Mega Gardevoir, the team already has 2 pokemon with stat-boosting moves so a 3rd is a bit unnecessary. Also, Taunt is a much more useful move for the team since it helps it break through defensive pokemon. Additionally, Thunderbolt isn't a useful move on this team because it doesn't hit noticeably more than its other moves that the team can't already break through. Also, Moonblast is unnecessary on Mega Gardevoir because Hyper Voice does more damage and its Pixilate ability after mega-evolving makes Hyper Voice a Fairy type move. For these reasons, I suggest running an offensive spread on Mega Gardevoir with an EV spread of 16 HP / 8 Def / 232 SpA / 252 Spe and a moveset of Hyper Voice / Psyshock / Focus Blast / Taunt. The EV spread allows it to survive 2 Psyshocks from Latios, while being as fast and offensive as possible. Focus Blast can be used to hit Steel types such as Heatran and Ferrothorn on a predicted switch.
Again, as sumwun mentioned, Breloom should be running Mach Punch over Drain Punch. Breloom is fairly slow, so having a priority move makes it a good revenge killer. Mach Punch is also boosted by its Technician ability which boosts its power to the point where the damage from Mach Punch is close to Drain Punch's damage. Breloom isn't meant to be kept alive for a very long time (with the exception of certain matchups such as Mega Gyarados teams) so the HP recovery from Drain Punch isn't too useful most of the time. Also, the 4 HP EVs should be moved to Defense so that Breloom has an odd HP number, allowing it to switch into Stealth Rock one extra time. Finally, Breloom's nature should be changed to Jolly so that it can speed tie with certain pokemon such as Bisharp and opposing Breloom.
I know I might have changed the team more than you might have liked, but I think these changes are great for improving the matchup versus some of the threats I mentioned, while keeping as close to the original team composition, in terms of pokemon roles, as possible.
Summary of Changes
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for 6th pokemon
change set
change set
change set
Importable:
Gardevoir (F) @ Gardevoirite
Ability: Trace
EVs: 16 HP / 8 Def / 232 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Hyper Voice
- Psyshock
- Focus Blast
- Taunt
Breloom (F) @ Life Orb
Ability: Technician
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Swords Dance
- Bullet Seed
- Mach Punch
- Spore
Landorus-Therian (M) @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Earthquake
- Stone Edge
- Knock Off
- U-turn
Heatran (F) @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 188 SpD / 68 Spe
Calm Nature
IVs: 0 Atk
- Stealth Rock
- Lava Plume
- Toxic
- Protect
Clefable (M) @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 172 Def / 84 SpD
Calm Nature
IVs: 0 Atk
- Calm Mind
- Moonblast
- Thunder Wave
- Soft-Boiled
Latios (M) @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Defog
- Roost
