Pichu --> Pikachu --> Raichu
Alolan Geodude --> Alolan Graveler --> Alolan Golem
Magnemite --> Magneton --> Magnezone
Voltorb --> Electrode
Hisuian Voltorb --> Hisuian Electrode
Elekid --> Electabuzz --> Electivire
Chinchou --> Lanturn
Mareep --> Flaaffy --> Ampharos
Electrike --> Manectric
Shinx --> Luxio --> Luxray
Blitzle --> Zebstrika
Tynamo --> Eelektrik --> Eelektross
Joltik --> Galvantula
Helioptile --> Heliolisk
Charjabug --> Vikavolt
Yamper --> Boltund
Toxel --> Toxtricity
Pawmi --> Pawmo --> Pawmot
Tadbulb --> Bellibolt
Wattrel --> Kilowattrel
Source: http://bulbapedia.bulbagarden.net/wiki/Electric_(type)
Hope I helped :)
