What was your first Level 100 in Pokémon?

[Dreamy]

Mine would be my Typhlosion from my original savefile on Gold, back when I was still (even more of) a scrub

[Sayia]

Feraligatr in Blaze Black 2.

[Black Antrax]

Mine was Haunter in Pokemon Red Version. I kept training it and always wondered why it didn't evolve after growing a level, but I didn't mind because I've always liked it so much.

 

[LemonJones]

In 20 years of pokemon I've actually never ever raised a single pokemon myself up to lvl100. Closest was my Alakazam at 94 in pokemon yellow but then internal battery died on me or whatever the hell else can make it so it's unable to have any saved progress.

[Filthy Casual]

My first level 100 Pokemon was from Pokemon Red, the very first game I played in the series. Of course, the Pokemon that reached that level was the one I used the most...

Spoiler

 

Indeed, while Blastoise was my starter (started with Charmander, hated him, and switched to Squirtle), Gloom was the one I fell in love with. At the time, I didn't know how to evolve Gloom, and as such, I trained it to level 100. Of course, I ended up finding a guide and eventually evolved him to Vileplume, who is now my second favorite Pokemon of all time, but I still hold a soft spot for Gloom.

 

[Autumn Zephyr]

I, um, never got a pokemon that high in level before. the closest I've gotten was a Lv. 83 heatran in Diamond- the poor gal never even got the chance to learn her signature move!

 

This does mean that my first 100's likely going to be in either Reborn or Rejuvenation, though, so that's kinda neat~!

[Bardechia]

Back in gold/silver when I didn't know any better, my first level 100 was a Pidgeot - raised from a lowly level 2 that was caught in my first wild battle of the game

[Mimikyu dayo]

XY (what a surprise...), my entire adventure team lmao

Greninja, Charizard, Aegislash, Hawlucha, Sylveon and Goodra

[Perish Song]

Mine was a mewtwo in fire red version. 

[Hycrox]

ma boi GARCHOMP in platinum

[YinYang9705]

My 1st starter, a Jolteon in Pokemon XD, back in battle mountain, because I was to stupid to properly navigate the Cipher research lab. 

[Silvermyst]

Ninetales from Emerald was not only the first Pokemon I got to level 100, but my first Shiny Pokemon as well!

[DigitalAmber]

Being the fool I was at the time(complete fool, had no stratagy) I was either stuck on Cynthia or Cyrus in the gen 4 games and leveled up my Torterra to level one hundred. 

[Ethan Hunt]

My was charizard, followed by mewtwo then typhlosian, and the last one was the event  blaziken from x and y

 

[Guest Relinquished]

In the beginning, there was Charizard...

[hi_im_z0]

Blaziken in Pokemon Ruby

[Monochrome_Complex]

Rampardos in BW2 raising a rock mono team.

 

He got that way due to the team losing against the E4 so much LOL.

[Sunbean]

My Ampharos in Heart Gold was the first legitimate one. Before that, my brother trained my Empoleon in Diamond up to lvl 100 for me because he lost a battle.  I don't count that though.