Tapu Koko
I see where you're going with that. I'm guessing your idea is that you activate Electric Surge and Volt Switch to Hawlucha.
Hawlucha
So after you switch in Hawlucha, he/she will get the defense&speed boost from the Electric Seed and Unburden. Hawlucha's base defense is 75, but it's base special defense is 63, so that leaves your Hawlucha more prone to special attacks. (Be aware, most Psychic attacks are special). Maybe put on like Throat Chop or something.
Scizor
Most people don't use Weavile in OU. Pursuit is the worst move on your set, because it usually doesn't time correctly. If you come across a Weavile, remember that Fighting is neutral against Scizor. Your only weakness will be fire, which is a 4x.
Ash-Greninja
Ash-Greninja's defensive side is weak (67 Def 71 SpDef) so the ideal item (just so Battle Bond won't be wasted) is probably Choice Specs/Scarf, Bright Powder, or Lax Incese. The moveset is fine.
Latios
Latios has 6 weaknesses. I recommend going for the OHKO setup.
Latios @ Dragonium-Z/Dragon Gem
Ability: Levitate
EVs: 252 SpA / 4 Def / 252 Spe
IVs: 0 Atk
Timid/Modest Nature
- Draco Meteor
- Psychic
- Sky Attack
- Extreme Speed (if all else fails)
I hand-typed this moveset
Landorus
This is the one fault in your team. Landorus is too weak to run a lead. Otherwise, there's no reason to run Stealth Rock on a Landorus with no Speed EVs. You would need to run Jolly Nature. The problem is if they switch out, the stat changes will be removed, and their Attack will be back from 75% to 100%.
Hope I helped!
~Your pal, Nuivo