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Favourite Pokémon?
(hexbear.net)
My favourite Pokémon is Vaporeon, of course. I also like Eevee and all the other Eeveelutions.
Pikachu shocking Ash with electricity and refusing to go in the Pokéball was cool. Little electric-type comrade defending his freedom. 
Decidueye is cool, I just wish they'd give it a buff so I could use it competitively
Otherwise I like Venusaur, Espeon, Raichu, Dragonite, Feraligatr, Blaziken... Zoroarks illusion ability has won me so many battles on Showdown lol
I like too many
Of course you like the owl Pokémon (Decidueye, evolved form of Rowlet)!
GOOD choices (no such thing as liking too many Pokémon)
Thoughts on Hoothoot / Noctowl?
Hoothoot is perfect and I love them, Noctowl is great too like Decidueye I wish they were more viable for online but oh well. They'll make a buff owl Pokemon one day
Hisuin Decidueye is seeing some usage in VGC if you play that atm. It's kinda workable in trick room and has a really good signature move. It's speed stat is so bad though, not slow enough to always be good in trick room, not fast enough to always be good under tailwind
Deci is a comfort pick for me in unite, you line up these long distance arrow shots with spirit shackle. It's a skill shot move so has lots of skill expression to lead, charge and time your shots. It has pierce so you can cut through the front line to get their squishies (unlike snipe shot from inteleon which is single target). It's probably the best ranged secure (last hit of damage required to knock out objective Pokemon for your team) (next to solar beam or electro ball mew). Unfortunately you get punished easily for being out of position, and if you don't have a defender or bulky supporter (wiggly) to give LoS or wall for you z then you'll struggle in solo play