morogrim The 15 BP between Psychic Fangs and Photon Geyser is pretty massive once you start funneling it through multipliers. I mean, if we do Terrain + STAB + Band...
Psychic Fangs effective BP: 85 > 127.5 (+STAB) > 191.25 (+Terrain) > 286.875 (+Band)
Photon: 100 > 150 > 225 > 337.5
Which is a difference of ~50 BP. Which results in stuff like this...
252 Atk Mewtwo-Mega-X Psychic Fangs (BP 287) vs. 252 HP / 252+ Def Aegislash-Shield: 112-132 (34.5 - 40.7%) -- guaranteed 3HKO after 1 layer of Spikes
252 Atk Mewtwo-Mega-X Photon Geyser (BP 338) vs. 252 HP / 252+ Def Aegislash-Shield: 132-156 (40.7 - 48.1%) -- 64.5% chance to 2HKO after 1 layer of Spikes
Actual calcs...
252 Atk Choice Band Mewtwo-Mega-X Psychic Fangs vs. 252 HP / 252+ Def Aegislash-Shield in Psychic Terrain: 113-133 (34.8 - 41%) -- guaranteed 3HKO after 1 layer of Spikes
252 Atk Choice Band Mewtwo-Mega-X Photon Geyser vs. 252 HP / 252+ Def Aegislash-Shield in Psychic Terrain: 132-156 (40.7 - 48.1%) -- 63.7% chance to 2HKO after 1 layer of Spikes
Using a layer of spikes to simulate minor residual damage. Could be something U-Turning on it once or twice or whatever, doesn't really matter. Point being, Photon Geyser's BP increase allows it to potentially net notable KO thresholds Psychic Fangs misses, which is why people weren't really using Psychic Fangs.
And just picked Aegis as something that people usually run to self-Imposterproof check Xtwo, so they might use it to answer opposing Xtwo as well.
The Mold Breaker effect IS notable, but I can't think of anything it does relevant besides bypass Fur Coat and Unaware. Which... Moongeist Beam and Sunsteel Strike already do so... ¯\_(ツ)_/¯ Really the main difference there is one of our best attackers in the meta gets the Mold Breaker move, as opposed to ones who are viable but not top tier OR make a big sacrifice to run it (like Gengar not being self-Imposterproof with Moongeist except via Normalize).
I guess if we suspect Sunsteel Strike and Moongeist Beam with Photon Geyser I can get behind it, since they're almost the same thing except different type. (I wouldn't say Photon being special and physical viable is that big of a deal.)
Psychic Fangs effective BP: 85 > 127.5 (+STAB) > 191.25 (+Terrain) > 286.875 (+Band)
Photon: 100 > 150 > 225 > 337.5
Which is a difference of ~50 BP. Which results in stuff like this...
252 Atk Mewtwo-Mega-X Psychic Fangs (BP 287) vs. 252 HP / 252+ Def Aegislash-Shield: 112-132 (34.5 - 40.7%) -- guaranteed 3HKO after 1 layer of Spikes
252 Atk Mewtwo-Mega-X Photon Geyser (BP 338) vs. 252 HP / 252+ Def Aegislash-Shield: 132-156 (40.7 - 48.1%) -- 64.5% chance to 2HKO after 1 layer of Spikes
Actual calcs...
252 Atk Choice Band Mewtwo-Mega-X Psychic Fangs vs. 252 HP / 252+ Def Aegislash-Shield in Psychic Terrain: 113-133 (34.8 - 41%) -- guaranteed 3HKO after 1 layer of Spikes
252 Atk Choice Band Mewtwo-Mega-X Photon Geyser vs. 252 HP / 252+ Def Aegislash-Shield in Psychic Terrain: 132-156 (40.7 - 48.1%) -- 63.7% chance to 2HKO after 1 layer of Spikes
Using a layer of spikes to simulate minor residual damage. Could be something U-Turning on it once or twice or whatever, doesn't really matter. Point being, Photon Geyser's BP increase allows it to potentially net notable KO thresholds Psychic Fangs misses, which is why people weren't really using Psychic Fangs.
And just picked Aegis as something that people usually run to self-Imposterproof check Xtwo, so they might use it to answer opposing Xtwo as well.
The Mold Breaker effect IS notable, but I can't think of anything it does relevant besides bypass Fur Coat and Unaware. Which... Moongeist Beam and Sunsteel Strike already do so... ¯\_(ツ)_/¯ Really the main difference there is one of our best attackers in the meta gets the Mold Breaker move, as opposed to ones who are viable but not top tier OR make a big sacrifice to run it (like Gengar not being self-Imposterproof with Moongeist except via Normalize).
I guess if we suspect Sunsteel Strike and Moongeist Beam with Photon Geyser I can get behind it, since they're almost the same thing except different type. (I wouldn't say Photon being special and physical viable is that big of a deal.)