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Enter the Battle Tree, a competitive all-in postgame filler that pins you up against the toughest of the tough—it is the final obstacle that blocks the goal - the moon that blocks the sun, to be witty.

... but it's not all sunshine and rainbows here, honey. With greats like Cynthia, Blue, Red, and Wally roaming free, high-profile legendaries by any peak streak, the seemingly-rigged AI, and the pestiferously toxic—and equally annoying—strategies they harbour, the huge, verdant evergreen is by all means a troublesome maze that perhaps not even the champion of Alola themselves can conquer. So I'll help you be the conkerer of that tree. Geddit? Kappa


Step I: The TeamEdit

Slot I
As the most crucial slots of the three, your first slot should encompass all facets of any reliable lead: the stat distribution, typing, moves, the like. Whatever Pokémon is chosen here will appear in any game no matter what—contrary to popular belief, in the Battle Tree you a) cannot choose your lead and b) cannot see the opponent's team. So your lead should fare well in most match-ups.
So how do you do that? Simple. You pick something with one single weakness (or two, but there are few Pokémon that make a reliable lead and have two weaknesses). Why? Because if you have one weakness you're only weak to one type, and if you're only weak to one type you're only in a bad match-up roughly one eighteenth of the time (considering the fact there are eighteen types. That figure is rather optimistic, but you get the idea). That means you're not forced to pivot into one of your other two buddies, you can hold your own against most opponents. If you picked something like Exeggutor or Aurorus as your lead, for example, you'd have to switch into another Pokémon just so many times they'd be rendered nearly dead-weight, as they only perform well against such a restrained number of Pokémon because of their many, many weaknesses. This characteristic alone already makes a lead viable. Just don't pick something horrible, like Wormadam-Trash form. While it has one weakness, its name enough about it, thanks.
Secondly, you'll want it to run recovery; good recovery means good longevity, and if you already outperform the majority of Pokémon on the other side of the field, whenever you find yourself in a weak position, being able to recover right back up terrifies the opponent; it stops that euphoric feeling of "finally, that gosh-darned thing is finally down ..."—you want your opponent to be at a nigh pressure point throughout the entire game, and having a lead that does that for you is more you could ever want. This somewhat throws options like Eelektross and Forretress out the window, since both have mediocre longevity and lack of reliable recovery. Rest is horrible, period. But, equally, reliable recovery isn't required—it's incredibly useful, but costs you a moveslot, and if you're going for an-all-out offensively-inclined lead, it's usually a waste of one.
Finally, you want your lead to be both defensively—as covered by the above two paragraphs—and offensively potent—whether it's through raw power or boosting moves, it's whatever ices your cake. As opponents for whatever reason have a regular inability to pivot their Pokémon, being able to safely set-up in a comfortable situation without the opponent being able to bring you down is fantastic, and furthers the pressure point out of the realm of vision. Again, this isn't required, but is very optimal in many situations. If you have one weakness, opponents often lack anything to touch you; if you can heal up, any damage dealt can be easily patched up and remedied, to stop the opponent from bringing such a nigh threat to the oblivion of a KO; and if you can set-up, exploiting your near-always good match-up and the opponent's inability to switch out in the vast majority of times—*breathes in*—then you're set; you, my friend, have a good lead. Well done! You've passed the hard part.
Oh yeah, you're first slot is most likely your best Mega slot, too, since Megas are by general consensus the stronger Pokémon and your hardest-to-check Pokémon could use the extra power boost. If something else already has a Mega Stone and isn't your Slot I, don't bother changing your stuff around. So long as it uses it well you're good.

Notable examples:

212MScizor.png 302MSableye.png 423BGastrodon.png 310MManectric.png 479CRotom.png 089AMuk.png 598Ferrothorn.png 474Porygon-Z.png 143Snorlax.png

Slot II
Slot II should focus on what your Slot I lacks. Not in terms of weaknesses (that's something we'll need to cover in Slot III), but, rather, an attacking or—to a lesser extent—defensive front that, perhaps, they struggle to reliably fulfill. In my example, we'll take Mega Scizor; it gives me bulk, longevity, the ability to sweep in the blink of an eye, and priority, but it most certainly lacks speed,—base 75 doesn't cut it,—coverage,—both Steel- and Bug-types are not at all renowned for their offensive prowess, the former pretty much being a dyed in the wool defensive type, and the latter being, well, average on both sides of the spectrum,—and, above all, strength as a Special Attacker. So, let's tailor our Slot II around what I personally chose as my Slot I: Mega Scizor. I myself chose Hydreigon, not just out of the fact it's not too hard to come by in Alola, what with it being a QR Scanner-obtainable Pokémon, but also that its stats and movepool pretty much bespeak everything I lack with Mega Scizor: pace, jump-in-to-the-action Special power. Hydreigon can drop a Draco Meteor and, immediately afterward, U-turn out, not only gathering momentum, but synergising with Mega Scizor to a successful extent. On top thereof, it has pretty much all the coverage under the Sun, giving me a quick and easy Surf, Fire Blast, or Thunderbolt to go. It just ices the cake: it's a pairing often difficult to break through. But when you take into account Slot III, this is just all the more concrete. Also, out of pure coincidence, Hydreigon's typing doesn't fair too badly alongside that of Mega Scizor's, with it being resistant to Fire, and Mega Scizor being resistant to Fairy. But don't try to follow in this example if it will limit your options; after all, leave this to your next (and final) team slot.
But what do I do if I don't want to take the Mega Scizor route? Give me more options, you're killing me here!
Really, it'd be hard to list everything you'd need. If you want a strong physical or special attacker, take a gander at what's within your reach. Don't go over the top and spam the GTS all day for a Volcarona that will take you forever to find, or far too many Arceus or Meloetta to hope to have on the double. (Haha, get it?) The Alola Dex is full of pretty much everything you should need, just check up some stats, read up online on its viability and movesets, and you should be good to go. Just try things out! That's the fun of it, after all.