Aerodactyl (M) @ Focus Sash
Trait: Pressure
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Taunt
- Stealth Rock
- Stone Edge
- Aqua Tail
My lead of course. Focus Sash lets it get in Stealth Rock, and maybe even a Taunt or attack. Taunt is there to shut down other leads. Stone Edge provides a STAB hit for which I can damage Pokemon outside of Stealth Rock. After all, Chansey already isn't doing much attacking, so I can't have two "dead weights" on my team. Aqua Tail is for Donphan. It only gets a 2HKO or 3HKO depending on EVs and Nature, but with a critical hit it can take it down and if the opponent spends time Rapid Spinning or setting up entry hazards.
Chansey (F) @ Eviolite
Trait: Natural Cure
EVs: 252 HP / 248 SDef / 8 Spd
Calm Nature (+SDef, -Atk)
- Wish
- Heal Bell
- Seismic Toss
- Thunder Wave
Team support. Wish heals. Heal Bell removes status. Both help out the team a ton. Of course, injured Pokemon might switch in on Chansey looking to set up and go out in a blaze of glory, but Seismic Toss prevents that, and also prevents it from being completely Taunt bait. Thunder Wave also provides team support. I mean, how great is it that my Shaymin is now able to outspeed Accelegor? EVs give it max defense (as it is useless to give defense) while allowing it to outspeed most standard Chanset, even those who go 252 HP, 252 Sp Def, 4 Speed.
Krookodile (M) @ Choice Scarf
Trait: Moxie
EVs: 4 HP / 232 Atk / 16 Def / 16 SDef / 240 Spd
Adamant Nature (+Atk, -SAtk)
- Crunch
- Earthquake
- Aerial Ace
- Stone Edge
Physical Sweeper. Hit first, get Moxie boosts, sweep some more. Earthquake, Crunch, and Stone Edge provide the STAB and type coverage needed to take down foes. Aerial Ace is there for Virizion. The EVs are perfect. Know how I can tell? I won a battle against J98. My last surviving Pokemon was Krookodile. It had 2 HP left. So yeah, no change should be made to my stats.
Shaymin @ Life Orb
Trait: Natural Cure
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature (+Spd, -Atk)
- Seed Flare
- Air Slash
- Earth Power
- Giga Drain
Special Sweeper. Seed Flare just devestates foes. 120 Base power STAB attack that lowers Special Defense by two stages a fair amount of the time? Yes please! Air Slash and Earth Power provide type coverage. Giga Drain is there because See Flare is low on PP, and there are a fair number of Pressure users in UU. As such, Giga Drain is needed for backup STAB.
Cradily (M) @ Leftovers
Trait: Suction Cups
EVs: 28 HP / 172 Def / 108 SAtk / 200 SDef
Bold Nature (+Def, -Atk)
- Stockpile
- Recover
- Toxic
- Giga Drain
My first wall. Stockpile gives it great defenses, and it can heal damage with a combination of Recover and Giga Drain (which also damages). Toxic is the main form of damage, although Giga Drain uis there in case of Steel type, Poison type (I'd switch), or other events such as Taunt.
Cresselia (F) @ Leftovers
Trait: Levitate
EVs: 148 HP / 252 Def / 56 SAtk / 48 SDef / 4 Spd
Bold Nature (+Def, -Atk)
- Calm Mind
- Ice Beam
- Moonlight
- Psyshock
Second wall/tank. Calm Mind boosts its lower SP Def, while also raising Special Attack. Psyshock is used instead of Psychic because Chansey exists in UU. Ice Beam provides type coverage. Moonlight provides healing.