Joltik-Kid
Careful? Where's the fun in that?
Most shorts have the groups Pokemon in them...so it likely is Ash's OshawottMaybe that Oshawott in the short is a random one. There was a random Wobbuffet in the Meloetta short, right?
On Topic: They're distributing a Mewtwo with its DW ability that is Unnerve. Genesect won't be able to eat its berry, how evil is that?