First, you going to have to use that fish to get better pokemon, so good luck with that.

[Ahhh it's been a while since he's seen a poor bastard with a Magikarp. It brings him such wonderful memories. This guy seems like the type to go for the fish bat method too. ]

I hate to break it to you, but you aren't the first person that's been kidnapped and you aren't going to be the last person. No one knows why the hell any of us are here and who took us from out worlds. There is no way people can willing go back.