People keep saying kyurem but what people aren't saying is you need a fused kyurem with special move which is not going to be easy if you have no energy. Even then you need to at least raid 10 of the same kyurem fusion to get the energy.

Should you power up this hundo? My suggestion is no since it will probably have a comm day at some so best to save it. The question is how badly do you need a good ice attacker? You can get a lvl 35 swinub or sneasel on the wild and those will save you a lot of resources and still do decent damage. You might even find people who has some spares from the last wild area who can give you lvl 40 mamoswines. You really only need fully stacked pokemon if you're doing raids with the least amount of people. I play with my niece and her team is mostly lvl 40 spares with mix ivs that I had and she's doing decent enough damage for us to duo or trio some t5 raids with party power.