>>30296646I think someone said at 30 chain length they have the maximum of 4 perfect 31 IVs. Catched an Eevee, but can't check how it turned out because 'lol go catch 20 eggs to check IVs'.
Hidden Ability and shiny seem to be just random.
A generally good mon would be parasect. Easy to get, false swipe, spore, some hard hitting move and you are good to go.
Smeargle is also good, but takes a while to set up. But if you give it recover and recycle and a leppa berry you need no other recovery items for a chain.
It also depends on what you want to chain. If you wanna catch ghost mons you need a different setup to make sure you can hit them with false swipe.
If you generally need a walkthrough:
>get mon to near death(false swipe it to 1 HP)>use adrenaline orb>wait until second mon appears(waste turns by using adrenaline orbs, it won't use it up but still waste a turn)>kill second monalso
>kill the original every 20 or so turns so it doesn't run out of pp and struggle to death>make sure the mon that's left on the field is the same type you started the chain with, or it breaks>>30296966kill it, refight it after the credits.