I have a general purpose Talonflame that I use for breeding and grinding xp in the Chateau.
Talonflame (Nursemaid) @ Amulet Coin
Ability: Flame Body
EVs : As they came; pretty much turned out to be an even spread
? Nature (it's level 100, who cares?)
- Fly
- Steel Wing
- Overheat
- Return
Steel Wing is actually useful for Chateau grinding, because there are a lot of fairies around. Overheat takes care of the ice and grass types. It's a useful all-purpose nursemaid.
I also use a Hawlucha for capturing things
Hawlucha (Hawlucha-L) @ nothing in particular
Ability: Limber
EVs: As they came, again who cares?
? Nature
- Fly
- False Swipe
- High Jump Kick
- Roost
Fly to get places, Roost to keep things going if necessary and False Swipe for obvious purposes. I pair it with something with Yawn (a Snorlax usually, for no particular reason). Use Yawn, switch into Hawlucha, False Swipe (roost if necessary), capture.
At level 100, you can pretty much have anything with any stats and still have it be useful. It's really the moves that count.
(I also have a set of 6 level 100 pokemon with Pick Up, which has netted me an extra 4 leftovers to date, and a full set of pokemon with Sweet Scent, Thief, Frisk, Compoundeyes and all the other things you need. It's worth investing in these things, because they make life so much easier, frankly).