I'll even write a shitty paragraph for each mon to give reason:
>sceptile:
first starter I ever picked, nostalgia
>chandelure
played with it in white 2, don't really like fire types but love ghosts like it for design reasons and cause it has monstrous SpA
>clawitzer
pistol shrimp are my favorite animals and I couldnt believe it when I found out there will be a pistal shrimp pokemon
>heliolisk
Normal types are shit, electric is my favorite type after ghost
>electric
best ultrabeast design by a mile
>starmie
i've used in in a dozen playthroughs. amazing stats and coverage. even utility if you feeel like it
>Hawlucha
used it in two seperate X runs and competitively . like the design
>tyranitar
awful type, but hey, gozilla is kinda cool
>golurk
I love the band aid, and I can't get over how awsome it is that it can fly. didnt even need the ghost type to win over my heart
>crobat
used it in several playtrhoguhs, again like the design
>scolipede
same as hawlucha
>muk-A
always liked regular muk, the alola form elevates it even further
>hydreigon
I like th courage in its design. GF went a step further by making it and imo it payed off
>mimikyu
love it for the same reasons everyone else does
>avalugg
Ice is another awful type. Avalugg helperd my out in my PU team a lot
>skarmory
for me, forever the bravest bird
>haxorus
embodies brutaliy imo. enjoy the idea of a fierce beast
>xerneas
best box legendary imo. one of the few fairy types that actually display the elegance I'd expect from the type