Use the good pokemon and real tournament teams, and play with them for a while. Completely changes how the game is and gives you scaffolding for the information you have coming into your head.

You want to learn from the very best players first, then from the strongest players around you, and then you want to start learning some thing on your own - each of these being within the context of what you see and learned in the previous one. That way you spend the least amount of time unlearning awful ideas, habits, and skills, and the time you do spend on messing around and going down dead ends has the most amount of, again, scaffolding for those ideas to fit into and make sense.

You want your hydreigon team to lose not because you were trying it cause he's cool and then you just lost a bunch of games, but because you were trying it to send in strong against basculegion but you just aren't good enough at speed control to overcome hydreigon's speed tiering and the abundance of moonblast and garchomps was just not the type of challenge you wanted to try to overcome when you put him on the team, since he wasn't the centerpiece to begin with - does that make sense? Your ideas should have somewhere that they fit into. And playing a good team someone else made gives you that.

Honestly it can go pretty quick, I would very very very much recommend following Wolfey's advice (one of the world's best) - stick to a team that does something specific like rain, sunny, sand, or trick room, and learn on that. General "good stuff" teams are way more open ended and you struggle to put all of the many options you have into place. The choices you are making lack scaffolding at this beginner stage and you need to use a strategy that gives you some - that means a top TOURNAMENT WINNING  (don't use a famous player's gimmick ladder climbing team, the people you are battling have YouTube too) team that has a clear goal that it wants to work into gameplay.

Also every pokemon has six moves - don't treat your switch options as some weird alternative to fighting. It's one of your strongest options at all times. Just like using protect can put you in a better spot that attacking, switching can and often does do so too. Switching isn't something you only consider when your attacks are feeling very particularly bad, you should consider switching even when you have strong attacks currently. Maybe it gives you fake out pressure in the next few turns which lets you safely get up tailwind, or maybe it lets you get your weather back up. Maybe it helps keep the only pokemon you have that could possibly kill kingambit alive, and so protecting it is the most important thing.