On the contrary you usually have to sack something as well to get greninja in safely since it's so frail and doesn't like taking unnecessary damage unless you switch into a predicted ice shard or physic move.
Also bout this "I have to use stall to use chansey" statement is incorrect. There's this thing called balance teams where you use a few walls and the rest are physical/ special sweepers and wall breakers. There are other viable play styles you can use as well. Trick Room, Volt -Turn, Rain Offense, Sticky Web. Just because you like to play a certain play style, that doesn't give you the right to make that the one true accepted play style. Either adapt or don't play.
And about this whole check/counter definition. Counters are pokemon that can switch into any move an opponent goes for and threaten to kill it back like Defensive Landorus-T > Terrakion. A check is something that can't safe switch into it but can threaten it out if given a safe switch into it. Azumaril can check diggersby with an aqua jet, but can't counter it because it will die to a return/earthquake if it tries to switch into it.
Many things wrong with this: Firstly,
Trick Room, Volt -Turn, Rain Offense, Sticky Web.
None of those are even any good.
Trick room is pretty lack luster.. the typing syngery on trick room teams are extremely poor and team match-up dependant. When your trick room goes away you're pretty screwed as trick room teams lack fast revenge killers outside a couple priority users that can be walled with common OU pokemon (talonflame vs. rotom).
VoltTurn cores just recently become good because of u-turners and volt switch users having good syngery together dealing with threats (Lando who glues everything, mag+beedrill, rotom requiring it, etc) it's not really a playstyle but more of just a teambuilding core. I guess rotom-wash+ferro is a playstyle because they work good together, Not.
Rain Offense is pretty meh as well.. again typing syngery is poor and the weather nerf hurt it alot this gen, it got a bit better cause of swampert but ferrothorn and sceptile pretty much plow through it now.
Sticky web is the most useless of all.. just bring in bisharp, GG, not to mention half the tier doesn't care about sticky web and defoggers are fucking everywhere.
Not that any of this has to do with greninja..
And about this whole check/counter definition. Counters are pokemon that can switch into any move an opponent goes for and threaten to kill it back like Defensive Landorus-T > Terrakion. A check is something that can't safe switch into it but can threaten it out if given a safe switch into it. Azumaril can check diggersby with an aqua jet, but can't counter it because it will die to a return/earthquake if it tries to switch into it.
This is false, a
check is something that CAN switch in, and threaten it out the majority of the time. A
revenge killer is something that comes in after losing a pokemon, and kills or threatens the killer in return.. such as your azumaril/diggersby scenario. You got the counter thing down but just because a pokemon
can take something out does
not mean it's a check if it is not a reliable switch in 6/10 times. Mega-Man, beedrill, talonflame, those are all classified as revenge killers for ninja, they do threatening him out, but then what good did they do if ninja just going to switch into lando to wall them? Ninja is still alive, and now you're forced out and the cycle repeats.. which makes ninja very unhealthy for the metagame.
Speaking of switching..
On the contrary you usually have to sack something as well to get greninja in safely since it's so frail and doesn't like taking unnecessary damage unless you switch into a predicted ice shard or physic move.
Not nessecarly.. see, the benefit of greninja's typing is he CAN switch into a fair ammount of pokemon. Ice shard? Greninja. Lava plume? Greninja. Psyshock, flash cannon, scald, hydropump, will-o, icy wind (Choiced keldeo will still be forced out and something hit hard), ice beam, shadow ball, dark pulse, knock off, iron head, gyro ball, bullet punch, defog, protect, fire blast, flamethrower? Greninja. and that's just what comes off the top of my head.
Point is, greninja is very anti-meta. He can win is almost any scenario with his coverage, and scouting what coverage he is carrying usually cost a mon. Sounds like mawile in a way. Checks nearly the entire tier on it's own, yet has very few checks for it depending on the set.