I tend to use Kirby and Pikachu. Though I'm not that good with him, I like using Roy.
As I said eariler, all the clones' moves should be altered.
I hope they don't use trainer to substitute all the Pokemon characters. With the exception of Pichu, all the Pokemon chars are good (yes even Jigglypuff, if you know how to use her moves and sleeping attack right)
I hope Tails will be there to join Sonic.