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Good evening, fellow bug enthusiasts. I have a long story for you.
Last year, I set myself the goal to beat the battle tree (50 win streak) on Ultra Moon using only bug types. I'm not a good battler, and all of this was a learning process for me. I chose to use bugs because I love bug types and I felt I wanted a real challenge.
In singles, I cheesed it.
Crustle with Sturdy and a Custap berry to set sneaky pebbles and knock off for the lead.
Truant Durant to use Entrainment.
Scolipede with Water-Z off Aqua Tail to Protect/Swords Dance up while Speed Boost racked up.
That was simple to put together and simple to get through. Scolipede was chosen over a Quiver Dance booster because it's 3 turns quicker, plus the best coverage move to put with Bug is Water, and Scolipede gets Aqua Tail.
I only got back into pokemon, and into battling for the first time after watching some VGC world championships videos on youtube last year. I enjoyed watching doubles the most, so that was my main goal, but it was the hardest. I couldn't just cheese it easily like the Truant strat. I did beat the Battle Tree in Doubles on Moon using the ol' Trick Room/Belly Drum Snorlax set. Guess what? No Bug type has access to Trick Room. All those great super-slow Bugs like Escavalier, Vikavolt, Shuckle, and Forretress would remain, well... slow. So I couldn't go for that, and the overall weakness of bug types meant I couldn't brute force my way through. The limitation of typing also meant I would eventually run into a barrier, as the battle tree will adapt to your favourite choices and begin throwing fire and rock at you constantly.
Pic related is my big box of bugs. I have another box half full. Each one of these has been bred and trained for competitive use, some more successful than others. The Masquerain, Scizor, 2nd Vivillon, and Shuckle are all shiny thanks to excessive breeding for perfection.