Ok

@EveeChu Scizor is Gen 2. It's pre evo is Gen 1, however

O h I meant Scyther, I get them confused sometimes, thanks

1. Eevee

2. Typhlosion

3. Salamence

4. Arceus

5. Volcarona

6. Greninja

7. Buzzwole

8. Toxtricity

Gen 1 - Pikachu

Gen 2 - Quilava

Gen 3 - Sceptile

Gen 4 - Infernape

Gen 5 - Oshawott

Gen 6 - Greninja

Gen 7 - Rowlet

Gen 8 - Dracovish

This hard

Gen 1: Dragonite\Mew

Gen 2 : Scizor

Gen 3: Altaria (used in BDSP to beat Cynthia)

Gen 4 is HARD but I chose Arceus/Glaceon

Gen 5: Kyureum is my both fav typings!!!

Gen 6: Zygarde

Gen 7: Ultra Necrozma

Gen 8: Zacian/Inteleon

Gen 9 not a lot of options but Koraidon. We'll see later

Gen 1 = Chansey

Gen 2 = Quagsire

Gen 3 = Ludicolo

Gen 4 = Roserade

Gen 5 = Hydreigon

Gen 6 = Sylveon

Gen 7 = Golisopod

Gen 8 = Alcremie

Gen 1 - Dragonite / Blastoise 

Gen 2 - Umbreon

Gen 3 - Breloom / Blaziken

Gen 4 - Froslass

Gen 5 - Victini / Serperior

Gen 6 - Sylveon / Greninja

Gen 7 - Mimikyu / Decidueye

Gen 8 - Dracovish

Gen 1: Raichu

Gen 2: Espeon

Gen 3: Flygon

Gen 4: Yanmega (this one was difficult)

Gen 5: Hydreigon

Gen 6: Meowstic

Gen 7: Marshadow

Gen 8: Dragapult or Falinks

1: Rapidash

2: Scizor

3: Mightyena

4: Magnezone

5: Cinccino

6: Heliolisk

7: Toucannon

8: Darmanitan

Hisui: Decidueye