May already be known, as falcon has the same CG on squirtle, as both falcon and sheik can force an air release by just holding squirtle till he releases.
Walkoff aerials may also be a possibility, but those need more testing.
Best case scenario:
CG squirtle to the edge using grab releases (+pummels to rack up some damage)-->grab release-->walkoff aerial. (Fair, Nair or maybe Uair or RaR'd Bair.).
or just end it with a Dash attack
(I'm guessing all characters that can force an air release on squirtle can CG squirtle this way).
~Grab shenanigans.
Walkoff aerials may also be a possibility, but those need more testing.
Best case scenario:
CG squirtle to the edge using grab releases (+pummels to rack up some damage)-->grab release-->walkoff aerial. (Fair, Nair or maybe Uair or RaR'd Bair.).
or just end it with a Dash attack
(I'm guessing all characters that can force an air release on squirtle can CG squirtle this way).
~Grab shenanigans.