Mega-Furret

Mega Furret (Furretite)
Typing: Normal ------> Normal
Abilities: Frisk/Keen Eye/Runaway ------> Hustle
Stats: 85/76/64/45/55/90 ------> 85/116/89/45/70/110
New Moves: Close Combat, Extreme Speed

Reccomended set
Furret @ Furretite
Ability: Frisk/Keen Eye/Runaway ------> Hustle
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature
- Hone Claws
- Extreme Speed
- Close Combat
- Knock Off

Description

Since Furret has always been one of the "finest outclassed pokemon" - and since I hate how bad it was back in Pokémon Gold and Silver and how much time did I waste trying to level up with it - it's time to make this little pet shine (or at least try to). So scrolling down his movepool list, I saw a good and well known set up move called "Hone Claws", and there you have the main (and only) set behind my mega: Hustle Furret, with the Hone Claws to remove the accuracy drop and 2 brand new weapons in +2 priority STABbed Extreme Speed and Close Combat for coverage towards Rock and Steel types.

This Furret is mostly intended as a sweeper: 110 base speed is already good, and you won't even need that if not against Rock, Steel and Ghost types (thanks to Extreme Speed priority). After 1 Hone Claws, Furret hits very hard with its brand new stabbed move (which also fucks up Scarf users), and Close Combat + Knock Off are all the coverage it needs. Once you've removed some threat (which I'll explain in the next paragraph), and maybe helping its sweep with some Hazards, Furret has a good amount of chances  in order to setup a Hone Claws (adamant Mega-Tyranitar doesn't OHKO it with Stone Edge + Sandstorm damage) and start doing his thing.

THREATS
Anyway, Regardless the Defense boosts, Furret is still pretty weak: lots of walls can tank his hits and strike back way harder (for example Foul Play Mandibuzz, Hammer-Arm Chesnaught, or even a tank like Mega-Blastoise), and of course Focus Sash user are Mega-Furett main counter. And don't forget that it needs the setup so badly, so you have an almost-guaranteed free turn to hit this little Mega-pet.

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Mega Politoed (Politoedite)
Typing: Water ------> Water/Poison
Abilities: Damp/Drizzle/Water Absorb ------> Water Absorb
Stats: 90/75/75/90/100/70 ------> 90/75/110/115/140/70
New Moves: Recover, Sludge Wave

Description

Thanks to this set, Politoed becomes quite an annoying wall/tank to face, since it loses its grass weakness and gains lot of bulk on both sides (and also a decent boost in SpAtk). With - finally! - a useful move to gain heal back in Recover and his brand new STABbed Sludge Wave (Ice Beam who?), Mega-Politoed is able to take on lots of threats and strike back as well.

THREATS
Faster Electric, Ground and Psychic types are surely a problem for Mega-Politoed, but at the same time no one of them resist to his stabbed moves, so Mega-Politoed can fight back at any time.

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Mega Noctowl (Noctowlite)
Typing: Normal/Flying ------> Psychic/Flying
Abilities: Insomnia/Keen Eye/Tinted Lens ------>  Shiver (lowers the opponent's Special Attack stat by one stage upon entering the battle)
Stats: 100/50/50/76/96/70 ------> 100/50/90/96/136/70
New Moves: Heal Bell, Will-O-Wisp, Wish

Description

With Roost already in its movepool, and lots of buff in the defensive department, Mega-Noctowl is now a capable wall, and with both Wish and Heal Bell added to his movepoo Mega-Noctowl can be a great Clergy as well: Will-O-Wisp combined with his brand new Ability Shiver are capable of lowering both of the opponent's attack stats, increasing the chance for the Owl to wall it.

THREATS
Regardless three new additions to the movepool, Mega-Noctowl still lacks a decent move against Dark types, which are now supereffective against it thanks to its new Psychic typing. Ghost types are now supreffective as well, and the Owl is still weak to Electric, Ice and (most importantly) Rocks.

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Mega Sudowoodo (Sudowoodoite)
Typing: Rock ------> Rock/Grass
Abilities: Rattled/Rock Head/Sturdy ------>  Rock Head
Stats: 70/100/115/30/65/30 ------> 70/140/150/30/90/30
New Moves: Drain Punch, Head Smash

Description

Gaining a secondary Grass typing, Mega-Sudowood is now immune to Spore, Stun Spore and similar: besides, his Rock Head-Recoilless-Wood Hammer gains new power thanks to a bran new STAB. Other than that, Rock/Grass Mega-Sudowoodo isn't any longer weak to Ground, Water and Grass. With a boost in both of the Defensive stats (as well as in Atk) and two brand new moves in Recoilless-STABbed-Head Smash and Drain Punch for recover (Mega-Woodo only lowdown is the terrible Speed stat), here you have a piece of wood that hits like a truck.

THREATS
As I've already said, Sudowood has 30 base Speed, which means it would be outspeed by everything. Counting that stuff like Talonflame and Conkeldurr are still capable of 2hkoes it, and Kyurem Black is now able to OHKOes it with STABbed Ice Beam and some SpAtk investment, Mega-Sudowood has to be played with caution.