Hyper Beam is only effective when Pokemon have a high Attack stat, like Gyarados, but teaching it to every Pokemon isn't smart, it takes up space you can use for special attacks.
The card key is on the 5th floor, go there by elevator. Then take the path down, use the teleporter and teleport back again, and walk on.
I really need a good battle in Pokemon. I've started over my Pokemon now are level 43-52. And I use Venusaur, instead of that damn Victreebel.
Pikachu; lv. 50: thunderbolt, thunder, thunder wave, light screen
Charizard; lv. 43: slash, earthquake, flamethrower, fire blast
Venusaur; lv. 43: razor leaf, growth, leech seed, vine whip
Gyarados; lv. 52: surf, hydro pump, blizzard, hyper beam
Kadabra; lv. 45: reflect, psybeam, psychic, recover
Articuno; lv. 51: peck, fly, ice beam, blizzard