Is 100 the highest level a Pokemon can reach on Pokemon Pearl?

yes,in every Pokemon game it is the highest level you can get to for every Pokemon. In the old games the highest level was 99 those games are blue green and red

not true i used the cheat for 999 rare candys and got my Pokemon to 390

ok they're both pretty high but i used a cheat to get 10 000 rare candies to get my Pokemon to level 10 100