Galvantula @ Focus Sash
Ability: Compound Eyes
EVs: 4 HP / 252 SAtk / 252 Spd
Timid Nature
- Bug Buzz
- Thunder
- Volt Switch
- Sticky Web
I'm only going to comment on Galvantula 'cause that's the only Pokemon I've used, lol. Even then I've only used it on Gen 5 RU.
Imho using the Focus Sash is hardly worth it. Galvantula can tank a lot of non-STAB attacks. That's all he needs, since you're using him as a sweeper. That covers against unexpected moves and HP.
I recommend using the Life Orb. It gives Galvantula that little bit extra power that it's missing.
Volt Switch really isn't worth it. Galvantula is fast enough, yeah, it's just not when you've got Thunder. What are you going to use it against, anyway? It's not going to do a whole lot to Fire-types or Rock-types, and it's useless against Ground-types.
I recommend Giga Drain. It heals off Life Orb damage and it's a good counter to Ground-types, especially Water/Grounds. It also covers Rock-type, too. And it's a nice move to use when you're opponent is going to switch out. If they switch to a Ground-type, you just got a free turn to do some big damage and heal.