How to feed a mag: Depending on the mag form the way you feed it will change so it's a guessing game to figure out what form what food increases what stat.
The other foods I don't really know much, but they increase various stats maybe 2 or 3 based off the mag's evolution form.
first evolve form is lvl 10 then the next form is at 50 depending on which stat is highest will determine the next form.
About all I know so far.
Monomate, Dimate, and Trimate are mainly for power. Dimate and Trimate sometimes give defense which isn't that great.
Monofluid, Difluid, and Trifluid are mainly for mind.
star Atomizers raise every stat including synchronization and IQ.
Synchronization is how much your mag likes you.
IQ is how smart your mag is these two stats determine if it'll assist you during the photon blast limit at 100 or before the boss fight starts. It could heal you, cast shifta and deband, or maybe revive you in combat if you have died depends on the mag form.