@fasterthanlime Pokemon Gold/Silver hqd a Gym Leader named Whitney. Her main Pokemon is a Miltank (basically a cute punk cow) whose main attack was Rollout, a move that gets increasingly powerful as long as it hits up to a 5-combo. Miltank tanks quite fine and hits hard. If you weren't trying other moves than attacking, you'd have a hard time facing her.
Basically, she's the wake-up call for many young players trying to go through the game with one single pokemon.