That core is interesting, but it seems like kind of struggles a bit against Choice Band Entei in particular due to the high investment in Druddigon's Speed (Flare Blitz always 2HKOs even without hazards for instance). Entei would have Sleep Talk to absorb sleep or Extreemeseed to revenge kill Lilligant so then it can't do too much even if Entei is not on the field at that, and nothing in the core can switch into Flare Blitz. Granted, you could easily run Slowking or Kabutops, or run more HP to tank hits slightly better (although even at max HP Flare Blitz still really hurts and Stone Edge still 2HKOs), but that is something that can really give that core some trouble.
Speaking of which, Entei is still the man when it comes to, well, everything regarding offense. Considering the offensive nature of RU at the moment, Extremespeed is really helpful in such an offensive metagame where fast, frail foes such as Sceptile, Accelgor, Absol (not fast but it has Sucker Punch), Sigilyph, Lilligant, and others are pretty much packed on every team, which gives a sort of universal revenge killer and emergency check for 90% of set up sweepers. Entei has the bulk to take pretty much survive any hit at full health (including random HP Rocks, which makes for a good user of Sleep Talk) and Flare Blitz still charges through pretty much everything that isn't a bulky resist, Omastar, or Kabutops, but its even moreso than usual with the recent increase of Druddigon and Slowking as the Fire resist for teams, which can still deal with it but not as well as other checks such as Qwilfish or Poliwrath (which have subsequently seen a decrease in usage)
Of course, this is something everybody knows already because Entei is so common and good, but I felt the need to point it out, because I feel like Entei is possibly better than ever aside from maybe when Yanmega was around or something like that.
Speaking of which, Entei is still the man when it comes to, well, everything regarding offense. Considering the offensive nature of RU at the moment, Extremespeed is really helpful in such an offensive metagame where fast, frail foes such as Sceptile, Accelgor, Absol (not fast but it has Sucker Punch), Sigilyph, Lilligant, and others are pretty much packed on every team, which gives a sort of universal revenge killer and emergency check for 90% of set up sweepers. Entei has the bulk to take pretty much survive any hit at full health (including random HP Rocks, which makes for a good user of Sleep Talk) and Flare Blitz still charges through pretty much everything that isn't a bulky resist, Omastar, or Kabutops, but its even moreso than usual with the recent increase of Druddigon and Slowking as the Fire resist for teams, which can still deal with it but not as well as other checks such as Qwilfish or Poliwrath (which have subsequently seen a decrease in usage)
Of course, this is something everybody knows already because Entei is so common and good, but I felt the need to point it out, because I feel like Entei is possibly better than ever aside from maybe when Yanmega was around or something like that.