Hello Monotype,
I'm not going to talk about classic issues because like Scp said, everyone knows most opinions, so, let's talk about Greninja-Ash.
I've played some games with Greninja-Spec and it's terrifying.
First look, we see its huge stats:
145 Atk/153Sp.Atk/132Speed. (We won't consider its defenses because it's useless as it most of type 0HKO before being hit).
153Sp.Atk, one of the best Sp.Atk in all the metagame with a wonderful speed, 132 allow Greninja-Ash to outspeed all the Metagame (Including 71Speed Scarf).
As you know, we need to kill one Pokemon to make "ashevolve" (I don't care how is it called) Greninja to have Greninja-Ash, this is easy as Greninja is already really fast and decent offensively.
Other particularity, Greninja-Ash gets Water Shuriken "boosted": Hit 3 times with 20BP → Priority special Stabbed move 60BP.
It looks like Scizor-Band with BP, no I'm joking, Water Shuriken Specs is clearly better.
Some calculs who show how some Pokemon who outspeed Greninja-Ash with a boost in speed (to deal with Greninja) are mostly killed by that:
So, now, people will say: "Hey boy, ground has Gastrodon, Rock has Cradily, Fire has Volcanion,..."
Sure, you're right, but:
252 SpA Choice Specs Greninja Dark Pulse vs. 4 HP / 0 SpD Volcanion: 241-285 (79.8 - 94.3%) -- guaranteed 2HKO
(2HKO the AV set→ Not a check)
252 SpA Choice Specs Greninja Ice Beam vs. 252 HP / 252+ SpD Cradily: 228-270 (60.6 - 71.8%) -- guaranteed 2HKO after Leftovers recovery
(Nothing to say here).
252 SpA Choice Specs Greninja Dark Pulse vs. 252 HP / 252+ SpD Gastrodon: 181-214 (42.4 - 50.2%) -- guaranteed 3HKO after Leftovers recovery
(Dark Pulse has 20% to flinch, you only need one to get it).
I think Greninja-Ash (like Kartana) give to Dark (And steel with Kartana) who is neutral against some types, give a "matchup" (not the right term but I don't know how say it in English but I think you understood me).
Especially for Greninja-Ash used in Dark type against Ground, Rock, Fire.
In addition of that it breaks easily most types who isn't prepared for Greninja-Ash.
Little Bonus:
252 SpA Choice Specs Greninja Ice Beam vs. 0 HP / 0 SpD Tapu Koko: 210-248 (74.7 - 88.2%) -- guaranteed 2HKO → Greninja Ash Specs.
252 SpA Choice Specs Protean Greninja Ice Beam vs. 0 HP / 0 SpD Tapu Koko: 237-280 (84.3 - 99.6%) -- guaranteed 2HKO → Greninja Protean Specs.
... You can see here Greninja-Ash is less powerful than Greninja Protean concerning no-stabbed move but still do a lot of damage.
But that's the only special move who isn't stabbed used here.
Some replays (Sorry, not a lot but I didn't have think to save replays):
http://replay.pokemonshowdown.com/gen7monotype-494818239 (Vs Arifeen's steel I guess)
http://replay.pokemonshowdown.com/gen7monotype-495370603 (Vs Terror's fairy)
Sorry for my English btw, be indulgent.
I'm not going to talk about classic issues because like Scp said, everyone knows most opinions, so, let's talk about Greninja-Ash.
I've played some games with Greninja-Spec and it's terrifying.
First look, we see its huge stats:
145 Atk/153Sp.Atk/132Speed. (We won't consider its defenses because it's useless as it most of type 0HKO before being hit).
153Sp.Atk, one of the best Sp.Atk in all the metagame with a wonderful speed, 132 allow Greninja-Ash to outspeed all the Metagame (Including 71Speed Scarf).
As you know, we need to kill one Pokemon to make "ashevolve" (I don't care how is it called) Greninja to have Greninja-Ash, this is easy as Greninja is already really fast and decent offensively.
Other particularity, Greninja-Ash gets Water Shuriken "boosted": Hit 3 times with 20BP → Priority special Stabbed move 60BP.
It looks like Scizor-Band with BP, no I'm joking, Water Shuriken Specs is clearly better.
Some calculs who show how some Pokemon who outspeed Greninja-Ash with a boost in speed (to deal with Greninja) are mostly killed by that:
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 4 SpD Excadrill: 474-564 (131.3 - 156.2%) -- guaranteed OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 36 HP / 0 SpD Victini: 342-402 (97.7 - 114.8%) -- approx. 93.8% chance to OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Landorus-Therian: 402-486 (126 - 152.3%) -- guaranteed OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Terrakion: 366-438 (113.3 - 135.6%) -- guaranteed OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Raichu-Alola: 192-228 (73.5 - 87.3%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Charizard-Mega-X: 192-228 (64.6 - 76.7%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Scolipede: 228-270 (88 - 104.2%) -- approx. 12.5% chance to OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 36 HP / 0 SpD Victini: 342-402 (97.7 - 114.8%) -- approx. 93.8% chance to OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Landorus-Therian: 402-486 (126 - 152.3%) -- guaranteed OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Terrakion: 366-438 (113.3 - 135.6%) -- guaranteed OHKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Raichu-Alola: 192-228 (73.5 - 87.3%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Charizard-Mega-X: 192-228 (64.6 - 76.7%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja Water Shuriken (3 hits) vs. 0 HP / 0 SpD Scolipede: 228-270 (88 - 104.2%) -- approx. 12.5% chance to OHKO
So, now, people will say: "Hey boy, ground has Gastrodon, Rock has Cradily, Fire has Volcanion,..."
Sure, you're right, but:
252 SpA Choice Specs Greninja Dark Pulse vs. 4 HP / 0 SpD Volcanion: 241-285 (79.8 - 94.3%) -- guaranteed 2HKO
(2HKO the AV set→ Not a check)
252 SpA Choice Specs Greninja Ice Beam vs. 252 HP / 252+ SpD Cradily: 228-270 (60.6 - 71.8%) -- guaranteed 2HKO after Leftovers recovery
(Nothing to say here).
252 SpA Choice Specs Greninja Dark Pulse vs. 252 HP / 252+ SpD Gastrodon: 181-214 (42.4 - 50.2%) -- guaranteed 3HKO after Leftovers recovery
(Dark Pulse has 20% to flinch, you only need one to get it).
I think Greninja-Ash (like Kartana) give to Dark (And steel with Kartana) who is neutral against some types, give a "matchup" (not the right term but I don't know how say it in English but I think you understood me).
Especially for Greninja-Ash used in Dark type against Ground, Rock, Fire.
In addition of that it breaks easily most types who isn't prepared for Greninja-Ash.
Little Bonus:
252 SpA Choice Specs Greninja Ice Beam vs. 0 HP / 0 SpD Tapu Koko: 210-248 (74.7 - 88.2%) -- guaranteed 2HKO → Greninja Ash Specs.
252 SpA Choice Specs Protean Greninja Ice Beam vs. 0 HP / 0 SpD Tapu Koko: 237-280 (84.3 - 99.6%) -- guaranteed 2HKO → Greninja Protean Specs.
... You can see here Greninja-Ash is less powerful than Greninja Protean concerning no-stabbed move but still do a lot of damage.
But that's the only special move who isn't stabbed used here.
Some replays (Sorry, not a lot but I didn't have think to save replays):
http://replay.pokemonshowdown.com/gen7monotype-494818239 (Vs Arifeen's steel I guess)
http://replay.pokemonshowdown.com/gen7monotype-495370603 (Vs Terror's fairy)
Sorry for my English btw, be indulgent.
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