Throughout this post so far, I've made a massive deal about Spikes. Spikes in this metagame are simply put, amazing. Considering the amount of relevant threatening breakers in the metagame that can force many switches, like Magearna, Mega Alakazam, Tapu Lele, and Garchomp, Spikes are VERY punishing. This doesn't even take into consideration the Spikes setters themselves, which are really diverse and are capable of filling a variety of roles, meaning that Spikes will fit on practically any build. Let me explain the role of each of these Spikes setters and what makes them so great. Greninja is a really versatile offensive threat that can force many switches thanks to its movepool alone, on which it can capitalize by setting Spikes rather than attacking. It pairs particularly well with offensive Psychic-types and other similar Pokemon that appreciate forced damage on Steel-types. Unfortunately, Greninja can often be a bit of a liability because of the presence of Mega Alakazam, which can punish Greninja by tracing Protean and is very threatening to the type of teams that Greninja fits on. Then there's Ash-Greninja, which I believe is notably worse, but it still can provide quite a lot for offensive teams. Most notably, the pressure of transforming really gives it a lot of opportunities to force switches and set Spikes, similarly to Protean Greninja. It also provides Water Shuriken, which can be really useful for certain offensive teams. It can often be hard to justify over Protean Greninja, though. Ferrothorn differs itself from both Greninja formes by focusing more on its defensive capabilities to set Spikes. Most notably, Ferrothorn is a really solid check to Electric- and Rock-types like Tapu Koko, Krilowatt, Rockium Z Necturna, and Mega Tyranitar, which are all pretty significant in the metagame, meaning that Ferrothorn will get ample opportunities to switch into play, force the foe out, and set Spikes. Ferrothorn really falls flat in the long term, however, because it's quickly worn down considering that Leech Seed and Leftovers are really its only form of recovery. It's also not that great of a check to Steel-types, meaning that you will often have to stack multiple Steel-types with Ferrothorn. Lastly, there's Arghonaut, which is also a defensive Spikes setter. Arghonaut targets a different group of Pokemon. Notably, it's an amazing check to Pokemon such as Volkraken, Garchomp, and Mega Tyranitar. However, Arghonaut kind of struggles to keep up with the pressure of many Psychic-types and Tornadus-T.