So here's a nifty video of pronunciations from the OFFICIAL Pokedex Pro 3D, an app sold for the 3DS at one point.
https://www.youtube.com/watch?v=0Loz61U6CuE

Browse the video for however long you feel, or hover over the bar looking for a particular pokemon from Gens 1-5.

Find a Pokemon that you pronounce wrong, and then report on your findings with how you say it, versus how THE MAN wants you to say it.

Here's some I've been mispronouncing and don't plan on changing, because what ever.

>Cobalion
Me: Ko-BALL-eon
GF: Ko-BAIL-ian

>Kyurem
Me: KEE-yuh-rem
GF: KYOO-rem

>Piloswine
Me: Pillow-swine
GF: PIE-Low-Swine