At this point I'm pretty sure we win if we double-team Magby.
Case #1
Aron spams Mud-slap
Nincada spams tackle/w.e
Magby has to tie with mud-slap, giving Nincada free hit = win
Magby tries to attack one of us, we get two hits + blind with mudslap = win.

Whooper will have to manage on its own if we do this until we beat Magby. Alternatively.

Case #2
Aron spams mud-slap on Magby(tie game etc.)
Nincada helps Whooper.
Whooper beats up bird

Either one works, though Hoppip will likely attempt to intervene in case 2 and case overall seems the better choice to me, therefore it is what Dawkin will advocate with sound strategical mind.