Firstable, I'm sorry for my bad english ! I'm a new french player !
I'm p-lvl 45 with some good characters like Vista, Vergo, Arlong... and that's all.
And this is my question: I can upgrade my arlong, but if i do this he will returns to lvl1, so how can i train him speedly to hard level ? I know here are turtles but those are hard to drop in the story... Do you have a special method (with the characters you drop in the story for exemple) ?
I'm a little sad to have to train him with just characters level 5-10 because it's a long way.
What's your best advice please ?