Yep. Second move can be used in raids, gyms, and pvp. Mamoswine is currently the best ice type in the game, and (might have to verify this with the dps/tdo calculator on site) the best non legendary ground type not including garchomp (unreleased). So having both avalanche and bulldoze may be useful by switching through powder snow/mud slap with fast tms for different raids. Ultimately up to you and what your team needs.
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2nd Charge Move Useable in Gum/Raid Battles?
So I know that if you "purchase" a second charge move it is useable in PvP battles, but can you use it in Gyms or Raid Battles? I have a 98% Mamoswine and it has Buldoze for a charge move. With the Rayquaza raids coming up, I am trying to decide if it is better to use my only Charge TM, or purchase the second slot. Obviously if the second move is only used in PvP I will use the TM, but if it can be used any time I think I will just buy the additional move. What do y'all think?
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It depends on how patient you are. In the short term (raiding Rayquaza in a week), giving it a second move in combination with your one charge tm will guarantee a mamoswine with avalanche (if you get stone edge, using the charge tm will give it avalanche, as his charge pool has only 3 moves). In the long term, it may be better to amass an army of Mamoswines for future raids. Though outside of raid bosses with a double ice/ground weakness (or even just electric raid bosses), I feel Mamoswine loses its appeal. He can certainly fill spots in your other raid teams where the boss has a single weakness to ice; he's definitely a good pokemon and you can see where he lies on the dps charts compared to other choices.
If you have the Candies and Stardust, it is better to buy a Second move. RNG is ... not kind when it comes to using CTM's for me (I still have two 98% Machamp's with Close Combat because I just gave up trying to TM them to Dynamic Punch. Heavy Slam/Close Combat/Heavy Slam/reboot device/Close Combat/Heavy Slam/DRINK!!! is how it went for both. Then I spent 100,000 Stardust and 100 Candies and got... Rock Slide for BOTH.)
With only Stone Edge and Avalanche left to get, you've got a 50% chance of getting the one you want, and if you don't, then the CTM SHOULD get it for you as I believe Ancient Power is "Legacy" and not available by TM's. (Don't quote me on that because with my luck, Niantic will have a glitch where Ancient Power is unintentionally available via CTM for the second move and you'll end up with Bulldoze/Ancient Power.)
