Yes, because only GOOD Pokémon should be able to learn good moves.
Welp, time to take Aurora Veil away from Aurorus because le shitty Aurora Veil user XD How about Meteor Beam as well? Pretty sure that Aurorus only having Ancient Power would be good? Take away Blizzard and Ice Beam as well for good measure. Remember that Aurorus is a shitmon that's "weak to everything" so it can't have those two moves as well.
Now where do I start with Ledian and Meganium... And maybe Delcatty for good measure as well. Fuck it, take away Head Smash and Stone Edge from Rampardos. Earthquake & Wood Hammer from Torterra as well. Kommo-o also loses Close Combat, Body Press, Drain Punch, Outrage, and all the elemental punches. Goodra also gets its movepool neutered. Tyrantrum loses Head Smash, Stone Edge, Close Combat, Play Rough, and Earthquake.
FUCK IT, LET'S MAKE ALL THE SHITMONS WORSE SHALL WE :)