Jumpluff
Typing: Grass / Flying -----> Grass / Flying
Abilities: Chlorophyll / Leaf Guard / Infiltrator (HA) -----> Spore Scatter (User’s Grass-type status moves have +1 priority and hit through Substitutes if applicable.)
Stats: 75/55/70/55/95/110 (BST 460) --> 75/55/120/80/120/110 (BST 560)
+50 Def, +25 SpA, +25 SpD
New Moves: N/A
This mega evolution gives Jumpluff a great niche with priority sleep that hits through substitute, priority Leech Seed, priority recovery with Synthesis, and more. Priority paralysis is also useful. However, all of these priority moves are stopped by Grass-types. It also loses to Ice Shard users and Talonflame. Despite these weaknesses, Mega Jumpluff has what it takes to be a huge nuisance in the metagame.
Typing: Dark -----> Dark
Abilities: Synchronize / Inner Focus (HA) -----> Technician
Stats: 95/65/110/60/130/65 (BST 525) --> 95/125/120/70/140/75 (BST 625)
New Moves: Poison Tail, Knock Off, Double Kick
Mega Umbreon is different than most Mega Umbreons will be. Most of them will be focused on walling, but my Mega Umbreon will be focused on utilizing Technician-boosted coverage, utility, and good bulk as a bulky attacker. Mega Umbreon will change the playstyle of Umbreon dramatically. Umbreon already gets Sucker Punch from 4th gen move tutors as a STAB priority option, so its movepool isn’t as barren as you think. I gave it Double Kick (Jolteon gets it) and Poison Tail (toxic sweat) as movepool options.