Entei

Pressure
Enemy attacks lose 1 extra PP. Increases wild encounter rate.
Type Tier
Fire BL
Statistics
Min- Min Max Max+
HP
115
- 371 434 -
Atk
115
239 266 329 361
Def
85
185 206 269 295
SpA
90
194 216 279 306
SpD
75
167 186 249 273
Spe
100
212 236 299 328
Name Item Nature

Calm Minder

Leftovers Timid
Moveset EVs
~ Calm Mind
~ Flamethrower / Fire Blast
~ Hidden Power Grass
~ Substitute
132 HP / 228 SpA / 148 Spe

Entei can actually beat the standard Blissey with this set. You have to be at full health though, Sand Stream must not be up and Blissey must switch in on you using Substitute. Calm Mind, while Blissey Seismic Tosses twice to break your Substitute. Alternate Substitute and Calm Mind until you have 6 Calm Minds, then start frying Blissey. Keep your Substitute up if you can to protect from status and Dugtrio.

Name Item Nature

Sunnybeamer

Leftovers Timid
Moveset EVs
~ Sunny Day
~ Calm Mind / Hidden Power Ice
~ Flamethrower / Fire Blast
~ Solarbeam
120 HP / 240 SpA / 148 Spe

This can put quite a dent into teams that do not have Blissey or Snorlax and rely on their Waters, Tyranitar and/or Regice to stop Fire-types. Sunny Day lowers the power of Water-moves while boosting your Fire-moves and making Solarbeam a one-turn attack. Entei's Special Attack is kind of low though, so Milotic and Suicune may still stall you out. Calm Mind can help that, but Hidden Power Ice messes up Salamence and Flygon very nicely. Beware of Tyranitar switching into a Solarbeam, this will force you to stay in and finish Solarbeaming while Tyranitar can crush you with Rock Slide. This moveset is probably better suited on Houndoom, who is slightly slower, but has more Special Attack.

Other Options

Toxic is a decent move on Fire-types, since Waters generally do not like to be poisoned, and neither do Salamence, Tyranitar and Gyarados. Reflect supports your team against Snorlax and other physical threats. Roar is iffy on a Pokémon with little to no good resistances and such low Special Defense, you might hinder a Celebi with a Grass move instead of Psychic with it though. With Psych Up you can steal Calm Minds from others, but the most common Calm Minder (Suicune) isn't going to care much. Psych Upping a Regice that stole Calm Minds from you is priceless though, and it always works on Celebi. Entei learns Body Slam and other physical fillers, but while his attack is decent, he should generally stick to Special Attack because of Calm Mind and STAB. You could try a novelty Leer/Hidden Power Fighting set for Snorlax, Tyranitar and Blissey but don't expect too much of it—even Arcanine will do it better with Howl.

EVs

404 HP is Entei's asset when using Substitute. 401 should be used otherwise since you'll be able to survive 5 Seismic Tosses or Night Shades with Leftovers intact. 285 Speed beats Medicham while 296 is enough for any and all Heracross. If you really want to be speedy, go with 300 for Salamence and other 100 base, or just max it. Timid nature is your best bet. Load up on Special Attack, or if you're using a physical Entei, Attack.

Opinion

Entei has a poor movepool and defensive typing and is countered by Pokémon used on nearly every team. Blaziken and Houndoom have proven their worth more often in standard play, though Entei is less fragile and gets past Blissey in an unorthodox and sometimes unexpected way. He isn't bad at all, but he isn't anything special either. If you want a really good 101 HP Substitute Calm Minder, Suicune or Jirachi is probably the way to go. You may want to use Fire Blast on Entei since his Special Attack isn't ideal.

Counters

First off, Waters. Suicune and Milotic don't take much damage at all from Fire-attacks and can hit back with a STAB super effective Surf, while Swampert does the same with Earthquake. Swampert has to beware of Hidden Power Grass, which OHKOs him after a Calm Mind. Other, lesser used Waters will do fine, but these three are the most common. Then, Entei has a lot of trouble with Dragon Dancers. Tyranitar, Salamence and Gyarados can all hit him hard with Earthquake or, in Tyranitar's case, Rock Slide, and resist Fire. None of these are very fond of Toxic though, which is why Blissey and Snorlax make okay counters. Blissey can wall the Sunnybeam set and sometimes even the 101 HP Substitute one, and Snorlax hurts with STAB Normal moves or Earthquake. Both of these have enough HP and Special Defense and in Snorlax' case, Thick Fat, to wall Entei.