>>45082840>Are singular types weaker than dual types?Most of the time, yes. The only really good single types Fairy and maybe Water or Steel. That said there are exceptions, some Pokemon are good as fuck despite being single typed. Also some dual typings are such a bad combination that even single typing would be preferable.
>Is it a bad idea to double up on types?Depends. Which types? Which Pokemon? What's the rest of your team? Is it for competitive or just for roleplaying/storymode? The team you posted is incredibly unbalanced so I have to assume the latter, in which case it doesn't matter. Don't bother trying to gear towards a "competitive" team unless you're trying to play competitively. Stick with your bros if they are what's fun.
Also, cutesy team but I like it well enough. 4/6, not a fan of Stunfisk in any capacity and two starters is a bit tacky in my opinion. Here's my team as of Crown Tundra, I like steel types.