Monster Hunter Freedom was the basic game.... Monster Hunter Freedom 2 was an update.... Monster Hunter Freedom Unite was an expantion....
Just get the most recent one, the mechanics aren't changed much but there's new content in each game. Monster Hunter 3 is out, I think. Might wanna look at that.
He's talking about Monster Hunter Portable 3, which was released in Japan recently. All the content in this game is completely different compared to Unite, with few monsters returning from the last games. And yes, some of the Monster Hunter Tri content is in Portable 3.
It came out in december.... Its actualy quite different from the other games.... The village and farm is all new, 90% of the monsters are all new (and even some of the old ones like rathalos got an upgrade), 90% of the armors/weapons is all new (even the ones from old monsters like rathalos have a different look and skills), the cats get their own armor/weapon set instead of just being a costume, the maps and quests are all new, they took away the kitchen and replaced it with the onsen.... Basicaly exept for the gameplay its a whole different game..... Oh and they added a charge attack on the GS aswell as an arow rain on the bow....