>>54120606People cheat at Pokémon because it is just easier to do so.
It takes a lot of grinding just to train up a single Pokémon in SV which is arguably the most QOL friendly game in the series so far.
Money/raid grinding for supplements, mints, Ability Capsules/Patches, and Bottle Caps
Most VGC items are locked behind postgame
Many evolution stones are sparkle items in the overworld instead of being bought
Several other items locked behind auctions
Hyper Training guy located at a late game town
Many Legendary Pokémon can only be caught one per save file so if you want another you either have to wait for an event, transfer from a past game, or trade
It takes a few seconds to generate a Pokémon compared to what could take an hour to train up one legitimately.