Gengar - Pokemon Red, Blue and Yellow Guide - IGN

Pokemon Red, Blue and Yellow at IGN: walkthroughs, items, maps, video tips, and strategies

Skylar, Pokemon: Sinnoh Adventures Wikia

How to catch Zapdos in Pokemon Yellow - Quora

Here's a guide on catching a level 7 Mew on the original Pokemon Red, Blue and Yellow games - before getting the second badge. It works on the newly released 3DS virtual

How to get all HMs in Pokemon Yellow - Quora

Gengar - Pokedex Guide - IGN

Pokémon Yellow Version - Bulbapedia, the community-driven Pokémon encyclopedia

Gengar - Pokemon Black and White Guide - IGN

Koffing - Pokemon Red, Blue and Yellow Guide - IGN

Secrets - Pokemon Red, Blue and Yellow Guide - IGN

The best moveset for Gengar in Pokemon Red and Blue