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(After implementing this, please change all curly apostrophes (’) to non-curly ones ('))
[OVERVIEW]
Greninja is generally a very niche Pokemon on Doubles teams, (remove comma) due to its average offenses, attacking stats, which prevent it from getting many of the KO's KOs it should be getting. Its weak attacking stats and generally make other Pokemon better for fitting the role of a strong attacker. It is also very niche due to its weakness to speed control and priority, as it is has very low power (missing a word here, is this what you mean?) and relies on its high Speed to get by, and most Pokemon faster than it can KO or do massive damage to it, such as Talonflame, Deoxys-A, and Choice Scarf Landorus-T. It does have a niche on hail teams, however, as Protean allows it to spam powerful, (remove comma) STAB Blizzards with its high base speed, outpacing while its high base Speed allows it to outpace Pokemon such as Mega Diancie, (no hyphen) Latios, and Thundurus. As well, It is able to beat most of the things that hail teams have has trouble with due as well thanks to its Water-, (hyphen) Rock-, (hyphen) and Fighting-type STAB moves from its and decent mixed attacking stats. Despite its very high speed, it is incredibly weak to priority and speed control, and most pokemon faster than it can KO or do massive damage to it, such as Talonflame, Deoxys-Attack, and Choice Scarfed Landorus-Therian. (you state this earlier, so I combined it with the previous sentence to avoid going from negative qualities to positive qualities to negative again)
[SET] (remove a line break)
name: Hail Attacker
move 1: Blizzard
move 2: Hydro Pump
move 3: Rock Slide / Low Kick
move 4: Protect
item: Life Orb
ability: Protean
nature: Naive
evs: 64 Atk / 236 SpA / 208 Spe (evs, not Evs)
[SET COMMENTS]
Moves
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Blizzard under hail can be very easily spammed under hail, as it can hit both foes opponents for with perfect accuracy and is a powerful move. It also has great type coverage against many Pokemon, (comma) such as Landorus and Hydreigon. Hydro Pump is used so that Greninja can pick up a quick KO on against Rock- (dash) and Fire-type Pokemon that threaten Mega Abomasnow. (no hyphen) Mega-Abomosnow. Rock Slide can KO pick up the quick KO against Talonflame and Mega Charizard Y, (no hyphen) Mega Charizard-Y, discouraging them from switching in. Low Kick is an option to hit Kangaskhan, Ferrothorn, and Heatran more reliably than Hydro Pump for super effective damage. Low Kick is a safer move against Heatran due to Hydro Pump's low accuracy. (implied by "reliably", unless I'm missing something?) Protect is a staple move in Doubles, allowing Greninja to stall out field conditions or protect itself while its ally deals with a threat.
Set Details
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208 Speed EVs with a Naive nature is are enough for Greninja to outspeed (one word) Whimsicott, (comma) and Raikou, and more importantly, it outspeeds pokemon like Pokemon such as Thundurus and Mega Diancie. (no hyphen) 64 Attack EVs is are enough to let Greninja OHKO standard Heatran with Low Kick, (remove comma) as well as Bulky Mega Charizard-Y bulky Mega Charizard Y with Rock Slide, while the rest of the EV’s EVs are put into Special Attack to power up Blizzard as much as possible. Life Orb significantly boosts Greninja’s overall mixed-attacking prowess and offensive potential.
Usage Tips
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Greninja's main role is using Blizzard while being able to deal with Hail's checks with it's its coverage. Greninja can be used both either to whittle down Hail's checks early on, or cleaning or to clean up late-game with Blizzard when its it's checks and other Pokemon have been weakened enough for Blizzard to KO them down into Blizzard range. Greninja's should use its coverage moves to hit many of the threats to the hail archetypes, such as using Low Kick against Steel-types and Kangaskhan, (remove comma) and using Rock Slide hitting Mega Charizard-Y against Mega Charizard Y and Talonflame. Greninja should be brought in when there is a free switch in opportunity due to its frailty. fraility.
Team Options
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Mega-Abomosnow Mega Abomasnow is required as a Greninja partner for Greninja to work at all, as it sets up can set-up the hail for it Greninja to spam Blizzards, and Greninja wouldn’t be viable without its support. Ground-types like Landorus-Therian are good partners for Greninja since they can KO the Steel-types that threaten hail. Fire-types such as Heatran or and Talonflame are also good partners since they can wear down Steel-types, which are some of hails hail teams' biggest checks. Electric-types such as Thundurus are also good partners since they can beat Water-types, which Greninja struggles against. Quick Guard support from Pokemon such as Terrakion and Virizion is greatly appreciated for Greninja, as it hates taking priority attacks.
[STRATEGY COMMENTS]
Other Options
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Dark Pulse can be used to hit Aegislash and Jirachi, which can both take a hit from Blizzard and Greninja’s other coverage moves. Extrasensory can OHKO Fighting-types such as Keldeo, (comma) with a super-effective STAB which are some of hail teams' (apostrophe) biggest checks. Gunk Shot can be used to hit Sylveon and Gardevoir, both of which have high Special Defense and can take on of Greninja’s special hits.
Checks and Counters
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**Typing Advantage**: Since Greninja will be spamming Blizzard most of the time with its and has low offenses, most of the things Pokemon that resist Blizzard will be able to do a lot of damage back to Greninja. This group includes Water-types and Steel-types that resist Low Kick. Most Steel-types have to look out for Low Kick, however, as it hits them super effectively.
**Opposing Weather**: To be able to spam its best move, Blizzard, Greninja absolutely needs to have hail up, meaning that opposing weather setters, such as Mega Charizard-Y Mega Charizard Y and Politoed, can make it much less effective just by switching in. switching-in. (no hyphen) Sun also weakens Greninja's Hydro Pump. (period)
**Speed**: Due to Greninja’s low defenses, it is OHKO’d by most powerful Choice Scarf users scarfers, such as Landorus-Therian and Kyurem-Black, can OHKO it, making it a liability against teams that have Choice Scarf users. Choice-Scarfed pokemon. As well, It is also weak to common priority users such as Talonflame and Mega Kangaskhan. (no hyphen)
**Speed Control**: Since Greninja’s best quality is its Speed, having it be being slowed down by the likes of Thunder Wave from Thundurus and Gyarados, (remove comma) can easily prevent it from doing it’s its job, and dying. It’s Its high Speed will also always make it go last in under Trick Room, and Greninja has a hard time dealing with Trick Room setters such as Cresselia and Porygon2, making it lose versus against these types of teams. When Tailwind setters such as Suicune set it up, Greninja is put up by setters such as Suicune, it will be outsped (one word) and easily KOed. Icy Wind from Pokemon such as Jirachi and Keldeo can also lower Greninja's effectiveness by lowering its Speed.
**Utility**: Two of Greninja’s best moves, Blizzard and Rock Slide, are both blocked by Wide Guard users such as Aegislash and Conkeldurr.