Username: lilacfishie
Numbers: 18 16 17 10 2
Response:

Username: Prolixity
Numbers: 6, 15, 8, 9, 15
Response:
6. Guess which type this familiar is strong against. Rock, Fire
15. Name an attack you think this familiar has. Muddy Water
8. What environment do you think this familiar was found in? River
9. You found a TM! Which one would you give this familiar to make them more powerful? TM39: Rock Tomb
5. Guess the colour of the familiar. Purple

Username: phoe
Numbers: 2, 13, 14, 11, 20
Response: Answers go here:

As a Trainer; which familiar would you use to weaken the mystery familiar so you can catch it?

A caiman!

As a Professor; would this familiar change typing if it evolves?

Possibly! Maybe into a dragon or flying type..?

Is this a large or small familiar? (looks might deceive!)

Small!

As a Gym Leader; what other familiars would you have on your team in addition to the unknown familiar?

Moth and jellyfish!

Which berry do you think they like least?

Pinap -- just too tart for its delicate palette.

Username: kuropeco
Numbers: 14 12 13 8 18
Response:

Username: Subducting
Numbers: 19 7 7 18 10
Response:

19. Which elemental stone do you think this familiar would react to?

A water stone

7. Oh No! You're the Leader of Team Darkness! Is this familiar the legendary one you've been seeking?

Maybe! Either way, I need to try and catch it, muahahahah -sends my minions after it-

12. As a Trainer; which pokeball do you think is best to catch this familiar?

A net ball of course! Or maybe a lure ball?

18. Guess which type this familiar is vulnerable against.

Grass definitely. Potentially also electric? I don’t remember Pokémon types beyond the starter typings… < very ineffective evil team boss

10. Which berry do you think they like least?

A micle berry… because it’s super dry!

Username: Maxx
Numbers: 2, 13, 7, 6, 10
Response: 2. As a Trainer; which familiar would you use to weaken the mystery familiar so you can catch it?
A shuppy, it looks like there's a lot to sink their teeth into.
13. As a Professor; would this familiar change typing if it evolves?
Yes, it would inexplicably become a Dragon type.
7. Oh No! You're the Leader of Team Darkness! Is this familiar the legendary one you've been seeking?
It looks familiar yet alien, making reality rip apart at the seams! Yep, this is the Legendary all right.
6. Guess which type this familiar is strong against.
Rock-type because rock beats rock; wait
10. Which berry do you think they like least?
The bitter Rawst berry.