Coin C25 uses the Skunkhesh algorithm, for mining of which many different software and hardware solutions have already been released.

You can choose the most suitable pool for mining here:

poolexplorer miningpoolstats

You can use mining calculator here:

cointominetoday wabi

Recommended miner for AMD GPU: WildRig
Recommended miner for Nvidia GPU: T-rex

You can rent mining capacity for C25 here:

NiceHash MiningRirRental