You must try really hard. You have to trade and stuff.
In the National Dex, Mewtwo is Pokemon number 150.
there is 150 Pokemon not 44
150
150 pokemon
Pokemon 150 is Palkia, the Space Pokemon. You can find it at Spear Pillar.
There are 150 Pokemon, 1-150 are found in Fire Red and Leaf Green as well as future games.
Here is a list of all 150 Pokemon: http://www.serebii.net/diamondpearl/shinoudex.shtml The last Pokemon listed (#151) is not required to get the national pokedex.
150 Pokemon
About 150 or less.
go onto Pokemon .com
150
Mewtwo.