Let's see if I can help,
1. Having a motto is ok, the one you have seems cool because its not like the shows and thats good and I like the idea of the murging in the motto. Its ok if they say it sometimes I guess. I am not to sure but its ok.
2. It is ok, some fics deal with some trainer stuff and some none trainer stuff, it just all depends on how you make it go. But most likey if it has some its a mix but thats good people like that.
Hope that helps some.