As someone who got all 151 (got mew through GameShark rest was legit) I would say getting all 150 wasn't required to say you beat the game
Yeah, this. Beating the champion is completing the game. Catching every Pokemon is a 100% completion thing.
Hello there! I am a signature. I'm kinda surprised you're even reading me, to be honest. Most people wouldn't bother. You're better than that though. Thank you.