oh, theres been a few over the years
1 this one i REALLY can not understand why, but i used to, as\nd sometimes do now, pronounce suicune as swee-shoon. i have no idea why
2 I THINK you pronounce groudon grow-don, not as in grass grow but like the word ground. I always used to call it groo-don
3 Derpfish. nuff said
4 pideotto, being an australian, i pronounce it pidge-ee-oh-tow, rathher than the american pidge-ee-ow-tow
5 I pronounce timburr as tim-brrrrr, gurdurr as grrrr-drrrr and conkeldurr as con-kl-drrrr
6 I pronounce regice as rej-ice, the way its spelt, but i still pronounce watchog correctly
7 again, with the australian accent, i pronounce rattata as ra-ta-ta rather than -ra-taa-tuh
8 the obvious ar-see-us
9I sometimes calll audino tabunne (jap. name) and i pronounce audino or-dee-no, but its actually au-deh-no, but i hate the correct pronunciation
there are heaps more but it would take too long to list them all