Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-13682699-20170424063146

Technically there is 3 categories of lists you could make for this:

1)Pure ATK/DEF - who has higher base stats

2)Battle difficulty - how hard is the monster to defeat in the game as a player

3)Canon Lore - how strong the game says the monster is regardless of current stats/difficulty

Objectively, only the canon lore and ATK/DEF have any true merit to making a tier list of strongest monsters. Battle difficulty is determined by how the player interacts with monsters throughout the run and/or in battle.

Ex for ATK/DEF list:

God of Hyperdeath

Undyne the Undying/Lv 20 Player

Asgore Dreemurr/Toriel

etc.

Ex for Battle Difficulty list:

Sans/Undyne the Undying

Omega Flowey

Asgore Dreemurr

Mettaton EX

Muffet

etc.

Ex for Canon Lore list:

God of Hyperdeath

Frisk/Chara

Undyne the Undying

Asgore Dreemurr

Toriel

Mettaton

Papyrus etc.