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Dugtrio + Vikavolt IS a reasonably good combination, especially with how powerful Ground is, but you're going to encounter problems using them against seriously competitive players.

Vikavolt's biggest weakness is a really shallow movepool and a painfully low speed -- and pairing with the moderately-fast Dugtrio means that you can't make effective use of Trick Room. Dugtrio does at least help provide counters against the Fire- and Rock-types that Vikavolt will have trouble with, but both of them are going to fall on their face against Pokemon like Drampa.

Solgaleo is rather on the overpowered side, and it'll do well on most teams.

Pyukumuku is annoying. It's effective, and it's actually more effective the stronger the opponent is. Unfortunately for Pyukumuku, it's only useful once. It can't consistently take out more than one enemy Pokemon, and most players will figure out how to avoid the trap after fighting it once or twice.

The rest that you listed... Unfortunately, like Vikavolt and Alolan Dugtrio, they've all got their strong points, but they just can't go toe-to-toe with the big guys. If you're intending to play online and seriously compete against players who are in it to win, you'll want to pick better Pokemon. On the other hand, if you're just in it to have fun and don't mind occasionally getting stomped by someone taking things more seriously than you, then you can certainly have a good time with most of those.