Dont you mean the recent games: 3G/Ultimate and 4 (or w/e the latest one is lol)?
1 and 2 I think came out on PS2 o.O.
But the only a monster Hunter game ever listed for PS Vita games was Monster Hunter 1 & 2 Vita. From many sources, like WikiPedia for one.
3G was a 3DS exclusive that got a Home Console treatment on the Wii U, and 4 is just an exclusive like Resident Evil Mercenaries & 3rd Resident Evil 3DS game coming.
What other sources o.O?
I wouldnt trust Wikipedia cause I can easily edit it to saying "Monster Hunter 4G Ultimate Edition" for the Vita if I wanted to lol.
MH has never been announced or speculated from what I know for the Vita and Capcom has thus said that they wont be making it months ago as well. Not sure why people even bring it up XD.
Anyways kinda tired of the Resident Evil and MH news. Now I want to see a Mega Man or a Breath of Fire game from Capcom on the 3DS :(.
Well, I just remember in 2011 and the first some months of 2012, that it was listed on the list of PS Vita games as Monster Hunter 1 & 2 HD.
Anyways, Wikipedia has had such things listed since 2010 for 3DS games as Dragonball 3DS & Batman 3DS and they both came true after being listed since 2010 with an finish title finally, because they use to say working title.
And the only company that's putting any 3DS exclusives on the PS Vita is Warner Bros. with such games as Spy Hunter & Batman Arkham Origins 2, both originally 3DS exclusives by Warner Bros.