>>56829963ground would also hit electric and steel types super effectively, which I assume would be at least 1 of the types androids would have. He'd likely also seek something which could resist those types, aswell as handle Cell's bug typing.
He also wasn't able to see the flaws in super saiyan grade 2, so likely he would pic something with a low speed stat just because it also had a high offensive stat.
With all these things considered, Trunks would likely choose Camerupt in an attempt to counter his main enemies, but would be taken by surprise when his opponents use their superior speed and coverage moves to beat his slow frail mixed attacker.