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You start off with Caterpie in level 100, and the PokÃ©mon you get to fight wild, are in at least level 98, due to the fact that you may want them in their last evolution form.
This is on MeBoy 2.2, which means you can play with advanced graphics with no problems at all.
Go to settings, tick the "fit screen", untick the "keep proportions", tick the "advanced graphics" and set the advanced scalig mode to 3. Scroll all the way down, and set the value to 99999 in the "max loaded cart size" (or whatever). The last thing to do is to set the frame skip to 6, and now you can start to play. I got this from Mobiles24, so this is not a hack IÃ¤ve made. The guy I got it from got it from PokÃ©community, the home of everything PokÃ©mon related (including hacks). Have fun!