This is Tetris Attack with a Pokemon skin on it. The soundtrack has some really fun, boppin' renditions of songs from the Gold & Silver era. It's my favorite part of the game, and that's not to be dismissive of the rest of it. There are a few different game modes, none of which are very challenging or novel, but at least you get some variety.

Pokemon Puzzle Challenge is a fun on-the-go puzzle fix. On my emulation handheld, I think I prefer this over the SNES's Tetris Attack because the controls don't use the shoulder buttons.