0244 Entei

Fire Spin is generally preferred over Fire Fang for its superior energy generation, despite the latter offering slightly more damage output. 

Flame Charge is recommended for its lesser energy cost, as well as its guaranteed +1 ATK buff, though its STAB damage isn't particularly impressive. Scorching Sands has great power and coverage alongside a chance of dropping the target's Attack, and also ties for the lowest energy cost among Entei's Charged Moves. Iron Head is Entei's only other coverage option, and ties for the least amount of energy among Entei's charge moves. Overheat has the potential for big nuke plays if unshielded, or hit-and-run plays when shields are up, though this is more risky. Fire Blast costs too much energy to be worthwhile. Flamethrower is inferior. 

Entei is a mono-Fire type with average bulk in Great League. Unfortunately Fire-types aren't very valuable in this league due to the extremely popular usage of Water Pokemon. A somewhat cumbersome moveset also makes it difficult to choose when compared to other Fire-type Pokemon, which puts Entei in an awkward spot for its role. 

As a Fire-type, Entei comfortably beats meta Fairy-types and most meta Steel-types. However, inconsistent struggles against Melmetal and losses against meta Psychic-types makes it difficult to justify Entei's use, especially when Giratina is so ubiquitous. 

Like in the other leagues, Entei performs well against Fairy and Steel-types, but can struggle against the rest of the meta. Perhaps it's better to leave this hot dog on the bench.