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i dont really know what would work well with it honestly, havent actually used it seriously. but probably just things that cover ttars weaknesses well, fighting resists, water resists, etc. you may also want something to deal with electric types i suppose, since they're immune to twave, but i dont think any electric types threaten ttar anyway. and excadrill could be a good partner, sand rush core is nice + exca weakens teams for the hax set.
i'm just thinking off the top of my head here though. im sure you can come up with better teammates as well.