Is it good for battles?

[Tomatoman1]

I need to capture 2 of the members, but I think I will hunt them down tomorrow. The corphish is a pain to get, because it is a shiny team and it's hidden ability is super rare. About them more info when I get them. These members where a planning, and they aren't trained yet. For the members I have:

Milotic:
Marvel scale, calm nature, has a fantastic stat in speed.

Gyarados:
Intimidate, docile nature, has a defenitly good stat in defence.

Politoed:
Damp, timid nature, has a fantastic stat in attack.

Are these any good? I will let the other members know as soon as possible.