I'm assuming these are from the anime and not necessarily how these should logically be pronounced.
I really hate how they say several names in the show, namely MY-low-TICK, AR-kee-us, and GEAR-uh-TEE-nuh (gear-a-tina? Really?) Please tell me that Milotic at least will be 'my-LAH-tick' (same syllable emphasis as 'exotic'). My issue with 'AR-kee-us' is mainly that the 'c' in Arceus' name looks like a soft C-- My thought was that if they wanted it pronounced with a hard C, they'd just spell it with a K. (Also, AR-see-us just sounds flat-out better to me, but that's my opinion.) Giratina I've always thought should be pronounced something like 'Gi-RAH-tih-nah' (probably with a hard G)-- mainly because, again it sounds better to me... Though I think this one is because it avoids the incredibly-dumb sounding pronunciation of the female name 'tina' in there. That may be how it's pronounced in Japanese, but the cultural context of 'tina' is different for Japan, being as it's not really a name like it is here.
Also, I recently realized something about Blastoise's name.
It's a combination of the words 'blast' and 'tortoise', right?
Well, here's the thing. Tortoise is pronounced 'TORT-iss' (or TORT-uss)... It's not pronounced 'TORT-oyz'. So logically, shouldn't Blastoise's name be pronounced 'BLAST-uss' or 'BLAST-iss'? (It really sounds weird to the ear, but it's probably just nostalgia-headphones, if you think about it. I wonder if the 4Kids dubbers actually knew that and decided it should be pronounced differently, or if they were just downright too dumb to realize it.)
Incidentally, I'm not going to argue that 'BLAST-oyz' isn't the 'official' pronunciation, this is just food for thought.