I actually don't think this move will be very useful. It only have a 30% chance to burn. That means it will end up like body slam which is rarely useful.
Tentacruel will probably use it about as much as it will end up using surf. It won't change much because the chance of burn is so low.
It will be very useful on vaporeon. Vaporeon stalls a lot and it fits vaporeon very well.
Lanturn just won't be useful with the new pokemon with insane stats. It might work to some degree in uu...
Slowking already resists fighting type offence. It might show up some, but people use slowbro more, and on slowbro thunderwave is more useful.
It will not be useful on suicune at all. Suicune will be a sweeper. Hydro pump will probably be seen as much as surf. Suicune will nto stay crocune. It will probably have a sweeping set. It wil lrevenge kill the insane attackers iwth ice beam and a water attack. It will need power, not a chance to burn...
Swampert will use it perhaps. It won't burn intended targets. It will probably burn celebi most of the time... Also, quagsire usage will probably rise because unaware is a good ability for a water ground pokemon.
Boiling water will be very useful on milotic. Its use will probably be restrained to the lower tiers...
The fire type pokemon is slow. It isn't bulky enough to make up for this. I don't even know if it will be used.
The water ghost pokemon will probably get will-o-wisp. Ghost types get that...
The big fish thing has horrible stats. Nothing will make it useful.
All in all, boiling water will have a couple of very specific uses on certain sets, but it won't define the metagame. Its burn rate is bad, and people will like using will o wisp more. Look at body slam and thunderwave...
Tentacruel will probably use it about as much as it will end up using surf. It won't change much because the chance of burn is so low.
It will be very useful on vaporeon. Vaporeon stalls a lot and it fits vaporeon very well.
Lanturn just won't be useful with the new pokemon with insane stats. It might work to some degree in uu...
Slowking already resists fighting type offence. It might show up some, but people use slowbro more, and on slowbro thunderwave is more useful.
It will not be useful on suicune at all. Suicune will be a sweeper. Hydro pump will probably be seen as much as surf. Suicune will nto stay crocune. It will probably have a sweeping set. It wil lrevenge kill the insane attackers iwth ice beam and a water attack. It will need power, not a chance to burn...
Swampert will use it perhaps. It won't burn intended targets. It will probably burn celebi most of the time... Also, quagsire usage will probably rise because unaware is a good ability for a water ground pokemon.
Boiling water will be very useful on milotic. Its use will probably be restrained to the lower tiers...
The fire type pokemon is slow. It isn't bulky enough to make up for this. I don't even know if it will be used.
The water ghost pokemon will probably get will-o-wisp. Ghost types get that...
The big fish thing has horrible stats. Nothing will make it useful.
All in all, boiling water will have a couple of very specific uses on certain sets, but it won't define the metagame. Its burn rate is bad, and people will like using will o wisp more. Look at body slam and thunderwave...