It's gotta be the storyline, followed cloasely by the gameplay. If it's hard to play, it won't matter how good the story may or may not be.And the story PACING is key for me. I need to feel, pretty regularly like I'm making progress and working towards something. If I get sidetracked, I usually put the game down and forget to pick it up until a year later or more!
I guess I was 13 when I first saw a pokemon, as that's how old I was when the game came out! XDSo... then the first pokemon I ever saw was a Charizard. That's the full-grown one from Pokemon red, right? Yeah, my litle brother bought Pokemon. I though it was stupid at first. Now I'm the only member in my family who owns the new one.