In my opinion there are three sides to Monferno: the very high usage, the overwhelming pressure of boosting sets, and the set variety. If a Pokemon with one viable set has a usage stat of 85%, then it is clearly unhealthy. Monferno, however, has a multitude of viable sets with very different purposes. As such, from a building perspective you can't look at it as being just one 'mon. The usage of any one specific Monferno set is quite low - partly obviously because of competition with other Monferno sets, but partly also due to none of the sets being a lot better than the others.  Now regarding boosting sets. A look at the replays from this week's ORAS tours shows that barely any games were won by a boosting Monferno. Not only that, but SD and NP were barely even clicked. There are checks and counters to all Monferno sets. Vaccum Wave and Mach Punch only help so much against revenge killers, because they are rather week and require decent chip, even at +2. Lastly, the set variety. Here we have two parts: 1) team building and 2) figuring out which set it is in battle. The teambuilding aspect is not an issue. You don't need to find one check or counter to all the sets. Just see them as different Pokemon. ORAS is quite top heavy, so the number of Pokemon you have to prepare for is rather limited. Figuring out which set it is in battle rewards teambuilding knowledge and skill. One more thing I want to mention is that Monferno's win rate is exactly 50%. This holds true even when only looking at games where one of the players had a Monferno, and the other didn't. I know that the sample size of 21 games is pretty small, but it falls in line with the win rate of 55% Monferno had in december when I analysed replays.