Gengar vs Blissey

Gengar

Max CP: 2619

Gengar (Max)

CP	2619
ATK	261
DEF	156
STA	120

Best Moveset: Hex+Shadow Ball

Gengar is one of the top offensive Pokemon in the game right now. With an Attack stat of 271, Gengar has one of the best attack stat, third only to Alakazam and Dragonite but it's defense and stamina are low so don't bother fielding Gengar as a defender unless you have to, but with the right moves Gengar can give even proper endgame Pokémon a hard time during a gym battle.

Blissey (Max)

CP	3219
ATK	129
DEF	229
STA	510

Best Moveset: Pound/Dazzling Gleam

Chansey was already a high HP wall. Blissey is like Chansey on Hulk-serum, so that makes it a super-high HP fortress. Dazzling Gleam is the best defensive charge move but put 

any Blissey on a Gym and friend and foe alike will hate you, as they throw Pokémon after Pokémon at Blissey trying to dislodge or prestige it. And it better be high damage-per-second (DPS) 'Mon as well, because time runs out in Pokémon Go after 90 seconds. Yeah, it's fun and frustrating to be a wall.

Gengar CP2296 vs Blissey CP2533 (video below)

Result: Gengar win the battle but closely sacrifice.

參考來源