Since this thread got necroed, I might as well join in since there are a couple of pokemon names I pronounce differently then the OP. Maybe a moderater can edit the OP since a lot of errors that have been pointed out in the comments haven't been corrected.
I'm pretty sure spearow is pronounced sparrow (as in arrow) rather than spear-oh. In pokepark, the spearow shout there own name and they pronounce it sparrow too.
Fearow is debatable, because the 'fea' part can be based on either fear or feather. Personally I say fear-oh because I think the word fierce might have an influence here as well, but there's definitely a case to be made for farrow.
I have always pronounced the poliwag family like polly-wag, so without the long 'o'. I searched on bulbapedia and it says that poliwag is based on 'polliwog', an outdated term for tadpole. Judging from this, I think the 'poli' part in the entire poliwag family is definitely pronounced polly instead of pol-ee. There's someting similar going on with piloswine, which I have always pronounced pillow-swine. The 'pilo' part comes from pilose, which is pronounced pill-oose according to google (which uses a British accent so I'm not sure if the American pronunciation is different). This nudges towards PILL-oh-swine instead of PIE-low-swine. The only reason I can think of for pronouncing it PIE as in 'pile' is for the phrase 'pile o' swine', referencing piloswine being fat (also thick fat but that only came in gen 5).
I pronounce mantine like MAN-thain, as in Thailand, not tainted. This one is debatable as well, since the 'tine' part can come from either 'marine' or 'brine', the former leaning towards MAN-teen (as in kantine) and the latter leaning towards MAN-thain. Mantyke is pronounced like the latter one, so if that is any indication my original pronunciation was right after all.
Another wrong pronunciation that I think is actually a typo is bar-BOCH, which is closer to bar-BOACH (from loach, pronounced like coach). Furthermore, I personally put emphasis on the first syllable, BAR-boach, but I'm not sure if that's correct.
This has been said before but Regice should be RE-gi-ice, just like the other two regi's. I'm fairly sure it's pronounced this way in the lucario movie too.
I think vulleby is pronounced VUL-uh-bee, instead of VUL-uh-bye. It comes from baby after all.
There are also some unnecessary attempts to get closer to the actual pronunciation that kinda backfire. For example, SHAN-dih-loor. I think everyone knows how to pronounce lure, so you might as well make the pronunciation SHAN-dih-lure, because that leads to less room for misinterpretation. Loor can actually be pronounced 'lore', which isn't the right pronunciation for 'lure'. Some other examples are spiritomb and kricketune. 'SPEER' isn't the same sound as in spirit, and 'toon' isn't the same sound as 'tune', which is closer to 'tjoon'. Tune and spirit are words that most people probably know how to pronounce, so I think you might as well spell these words out in the pronunciation to avoid confusion. Just my opinion though.
Furthermore, there are quite a lot of emphasis errors, like lie-NOON and zig-zag-OON, which should be LIE-noon and ZIG-zag-oon. some of these have been pointed out before though.