It has been confirmed that the Mr. Mime that lives with his mom (Mimey) was caught by Ash off screen 

I want to give a hint but no matter what I say, it'll give it away

What is the only Psychic type that Ash has caught?

This is from the Hoenn series Advanced Battle

If I make multiple Anime Quizzes, expect this question every time

Which opening do these lyrics belong to?

Ash has not  caught a single Electric type other than Pikachu

You have to know every Pokémon he's caught to get this right

True or False: Ash has caught another Electric type Pokémon besides Pikachu

Brandon has three of the Regi's so its understandable

All of these answers are Frontier Brains to add that little bit of difficulty

Who was the Frontier Brain that Paul's brother, Reggie, never defeated but Ash did?

Eternatus belonged to Leon, Suicune to Goh, Articuno to Noland, and Heatran to a random trainer in the Diamond and Pearl episode "An Old Family Blend!"

There's a surprising amount that have been caught

Which of these legendaries have NOT been shown to be owned by a trainer in the anime?

It was a funny gag that it would always hit Piplup no matter what. They even once used it to track Piplup in a cave 

Gible should've had more development. It could've been cool to see a mischievous Gabite or even Garchomp

In the Diamond and Pearl series, which Pokémon did Ashs Gible keep hitting when using Draco Meteor?

Misty has never owned a Chinchou, although that would awesome

R.I.P Rachael Lillis. She was the voice of SO many peoples childhood. She will forever be missed. 

Which of these Pokémon have NOT been owned by Misty?

The other is obviously Poipole in the Beast Ball. I'm not counting Tauros as, yes, they were caught in Safari Balls but they were transferred into Pokéballs later on

Almost all of Ashs main Pokémon were caught in regular Pokéballs but there are 2 that were not. Which of these Pokémon were NOT caught in a regular Pokéball?

Serena's Fennekin evolved in a double battle with Aria

I don't think Ash could've done the things he has without using them for training

Team Rocket is the cause of a large percentage of the plot for the series including the evolution of Pokémon. Which of these Pokémon did NOT evolve due to Team Rockets schemes?

Yes, I know all Pokémon come from eggs, you know what I meant

Which one of Ashs Pokémon did NOT come from an Egg?

All of those Pokémon besides Trapinch has been shiny in the anime

I miss Crystal Onix

There have been tons of shiny Pokémon shown in the anime since the Johto series. Which of these shiny Pokémon have NOT been shown in the series?

Ash has also lost to Viola in that GIF up there

This is a MULTI ANSWER question. Last time I made one, I guess it wasn't very clear

Select all the answers that has a Gym battle that Ash has LOST only to win later

The first four are 100% true. Morpeko lost to Goh's Skwovet when it evolved into Greedent

Leon caught the Shiny Gyarados at the Lake of Rage

Iris has never used Mega Evolution, Dynamax, or Z- Moves

Team Rockets Morpeko won an eating competition

Gotta have some broad knowledge

Which of these statements are false?

The other names are also characters from Black and White

Hint: Black and White

Whats is this characters name?

I always have fun making fake names for Pokémon related stuff

Pretty genius way to let them battle and keep each one fresh without having dedicated Pokémon 

In Pokémon Journey's, what is the name of the machine that delivers Pokémon for Team Rocket to use in battles?

He never even caught it. Whiscash swallowed the ball and swam off 

I don't know how I feel about this gag to be honest. On one hand I don't want an overpowered Ball in the anime but why on this Pokémon?

Bonus EASY Question: The Master Ball had only made 1 appearance in the anime, belonging to a man named Sullivan. What Pokémon did he try to catch with it?

I got some advice that I should mix up my quizzes a bit. I've had this in the works for a while but now it's finally done. I'm also working on a Pokémon Movie Quiz which is almost done so look forward to that. As always, let me know what you think and enjoy!