It looks a bit like Gary, but in this version, he's called Ronald. He has blue hair, and whenever you fight him, he puts up a pretty darn good fight. Everytime you beat him, you will get a promotional card. I do prefer whole booster packs than those. I think your regular name in here is Red because Ronald's background color is Blue, so that makes sense.
Mulligans exist here too.
In case you don't know, a mulligan is when you draw 7 cards and you don't get any basic pokemon. In pokemon tournaments, many people try to cheat by declaring a mulligan when they just have a bad draw. That's considered cheating but is impossible to do in the gameboy card game. Another thing different from Pokemon Blue is that you can fight people over and over again. If you still remember from Pokemon Blue, after you fought someone, you couldn't fight them again.