What are some alternatives?
When comparing Pokemon Tower Defense and Bloons TD, you can also consider the following products
Fieldrunners - Fieldrunners is a game developed by Subatomic Studios, for Steam/PC, iPhone/iPod Touch, iPad...
Bejeweled Blitz - Our games are sprinkled with a whirlwind of smile-inducing awesomeness and polished to a shiny sheen that keeps the world coming back again and again.
TowerMadness - Tower Madness is an epic 3D tower defense game for iOS.
Towers of Oz - Towers of Oz for iPad, iPhone, Android, Mac & PC! Battle wooden soldiers, saber-toothed tigers and giant frogs in tactical battles as you defend the Land of Oz from the Dwarf King!!
Kingdom Rush - Epic game of tower defense available across multiple platforms.
Innotoria Tower Defense - Build, defend and annihilate legion of enemies in this new indie tower defense game