Basically every single poketuber is cancer and horrible.
That being said, there are a couple OK ones.
GameXplain is good at trailer analysis and finding the little hidden things in releases.
The GBA is the only good draft league, but this season they're doing a Let's Go draft, so I highly recommend you skip it and watch next time.
ShadyPenguin is a nice guy, so I like watching his Pokemon stuff. He stopped doing Pokemon for a while but is getting back in to it. He does Nuzlocke runs and his own, harder versions of nuzlocke runs as well. Occasionally he'll collaborate with other, worse YouTubers too. But even those are OK because they have interesting rulesets.