>>43437699To be honest I would just stick to have one bro and instead of training him with Pokémon battles I would go sparring with him so we both can become stronger.
The bonds would be much stronger than me having more Pokémon to take care of, which I'm sure I'll do badly because I cannot concentrate in more than one thing at the same time.
As for which species would I like as companion, I'm not too picky in that regard.