Scizor question

First of all, kudos for using "her'.

Second, you can use her very effectively versus Psychic.

Honestly? None. I do use the bug movesets for Eggs. I have read some use it for Snorlax or Blissey but I haven't done so yet.

Apart from being good against Exeggutor and a viable Option aganist Snorlax/Blissey, Scizor should be pretty good against Tyranitar. You hit with effective damage with both moves while resisting IT. Bite is weak on defense, so the only thing you have to really worry about is FB and here it could be the case that TRex is down before. Should be an option at least here too as an alternative to Machamp and Vaporeon.

I've wanted to try this move set for prestiging. It should be amazing to dodge with and fury cutter should let you use iron head a lot. Iron head fits nicely between dodges. Plus if the gym rework brings lapras back into gyms, probably be a good lapras option.