Well I remember in blue and red with that Missigno cheat or whatever, you would sometimes come across pokemon that were over level 100 while doing that cheat. but if you caught one they still gained experience points and when they grew a level it would send them straight back to level 100.
When we were little, my friend and I used to think that if you put Charizard first in your party and put the rest of your Pokémon in alphabetical order, you could level him up past 100. Eventually, he would evolve into Megacharizard, who was a Charizard with like, 3 tails and no arms. He would later evolve into Fujia/Fugia, the "best Pokémon ever."
"I reject your reality and substitute my own."-Adam Savage Gamertag: General Pickler
^Wow, my friend and I thought of a Charizard evolution when we were little, too. We thought that there was a secret stone called a lava stone that was REALLY hard to find. If you were lucky enough to find it, it would evolve Charizard, but only if Charizard was level 100. If Charizard was any other level and you tried to use the lava stone, he would die and never come back.
It wouldnt be good if they grew past level 100 because pokemon levels would be magikarp level 2,000,000,000,000 vs salamence level 1000 magikarp used splash too much attack power salamence fainted! BUT I would like pokemon to keep gaining experience because it would be cool to whip out your starter and it has like 3,000,000,000 experience!
Currently playing PMD2 and Mario Kart Wii Mario Kart Wii FC- 0087-6717-7895
They should at least up the experience cap. Since nowadays you can just automatically set every pokemon to 50 or 100 during competitive battles, there's no reason why the cap needs to be so low ingame.
Potter Intervention: http://youtube.com/watch?v=WmnyWlQDnns