Honestly speaking, this post is just full of mistakes.
1) Energy Ball, HP Fire and especially Iron Head should never be included on any Magearna sets.
Sure an Ice Beam + Energy Ball Magearna will 6-0 Ground teams, but it will also fail to accomplish many of the things this pokemon is so great at accomplishing. To use it's ability to run moves like Energy Ball as an argument on why it should be banned is simply wrong because it has no actual impact on the metagame.
Versatile =/= Viable, it can run those moves but it's only burdensome to Magearna.
2) Ladder experience is not a reliable source.
Laddering up to 1550-1600 is extremely easy, being able to get several accounts up there in a day is more a showcase of how much free time you have than of how dominant Magearna is. It doesn't matter how many accounts you "dominated" the ladder with, it should not have much impact on important metagame decisions. It would be better if you looked on how this Pokemon affected a higher level of playing (for example MPL where Steel and Fairy where very dominant in SM)
3) Magearna + Klefki do not dominate as well as mentioned.
-Poison: Only CM/Double Dance (CM + SG) threaten this type, any other set generally gets dominated.
-Grass: Does not suffer to this nearly as badly as mentioned, CM with flash cannon + aura sphere is needed to beat out the defensive core.
-Normal: Magearna in no way dominates Normal teams, with Chansey managing it and the only set that sorta threatens it (CM) loses to Diggersby.
-Ground: Magearna is really not the issue in this matchup on Fairy teams. On Steel teams, it isn't as huge as a threat unless the player uses the extremely situational cteam set.
-Bug: This type deals fine with Magearna, it's far from pushing the matchup to the edge.
-Psychic: Same as Bug.
-Fire: Straight up doesn't lose to Magearna unless played very badly.
Not saying Magearna is not an amazing Pokemon, but as a person who is still undecided, I would prefer to see better constructed arguments that would actually convince me instead of irrelevant and false "facts".
On behalf of the Magearna Prohibition Party, I regret to inform you that there was too much information in your post to address in a single sitting, so I'll focus on a couple of your points for now.
#3a: Poison.
As I had mentioned, Shift Gear was the primary test set, with Weakness Policy. Klefki was carrying Reflect and Light Screen, as I had stated. And although I didn't mention it, I assumed there would be no doubt that Klefki had Spikes. Generally, the famous key chain would depart from its Pokéball™, first establishing either Reflect or Light Screen, then continue by setting up 1-3 layers of Spikes, and conclude by erecting the missing shield before being sacrificed. Then Magearna would enter the fray, use Shift Gear, and have its Weakness Policy activated, as one does. Then it would often sweep Poison. Granted, my Fairy team with this Magearna set didn't win ALL of the time. More like 70-80% of the time against some of the highest ranking league members from several of the highest ranking leagues, during that part of the test phase. Naturally, without Magearna Fairy only wins like 20% of the time. Therefore, I was compelled by the scientific method of observation to mention this change.
#3b: Grass.
As I said, weakness policy Magearna with screens, Shift Gear, And Ice Beam beats Grass most of the time. Ironhead/Flash Cannon kills Cradily. Ice Beam beats everything that isn't Ferrothorn. It also kills Ferrothorn after, I believe, two hits. Perhaps three. Either Ironhead, Flash Cannon, or Ice Beam will kill Mega Venusaur after a few hits, depending on how bulk-supportive the Jurassic vegetable proves. Mega Venusaur also tends to continue attacking rather than recover or use Leech Seed, for fear of future boosts.
#3c: Normal.
Shift Gear with Ironhead has a tendency to beat Chansey after you get +3, from Earthquake Diggersby, Heatwave Mega Pidgeot, Fire Blast Exploud, etc. The Steel typing also lets Magearna resist Normal moves, while most other Fairies do not. Although I didn't test Magearna against many Normal team-inclined league members, it did beat those unreliable 1550-1600 Elo ladder teams around 60-70% of the time. Granted, I used more than those two Pokémon™, but Magearna did exceptionally well, regardless.
#3d: Ground.
Like Poison, I tested this Fairy team against high ranking league members who specialized in using Ground. With a 60-70% win rate. Although I found Air Balloon to be fairly effective against any land-contorting Pokémon™ holding one of the three Choice items, my preferred strategy of double Screen with Weakness Policy still worked most splendidly. I shall say though, that I did find Excadrill to be rather bothersome, and was generally better handled by Azumarill. Azumarill, in turn, gets countered by speed creep Seismitoad. Seismitoad, in turn, gets countered by Energy Ball. Along with Mega Swampert and Gastrodon. Hence why Energy Ball, although surely not my preferred fourth move, can be viable.
#3e: Bug.
I have actually played a trifle of Bug in my day. Perhaps 20,000 matches. And yes, I agree that Bug type is reasonably reliable for beating Magearna. Except when your attacks get cut down to half damage. Under the right circumstances, +2 Thunderbolt can sweep a Bug team. Circumstances which occurred with this set Around 60-70% of the time. Again, I used more than two Pokémon™, of which Togekiss was often a member. During which case, Togekiss was more effective, but Magearna was no less effective, elevating the win rate perhaps an additional 10%.
#3f: Psychic.
As stated, this specific Fairy team has a high win rate against Psychic. High in this case meaning 50-60%. The times when I had replaced Magearna, the effect was negligible. As you may note, I didn't spend a great deal of time talking about Psychic. I believe, literally only said one word about it; it's name. While giving a list of every type. The point of the list was mostly to highlight the fact that, with the right team, a Fairy team with Weakness Policy Magearna beats - or is evenly matched against - every other type.
#3g: Fire.
Like Psychic, I mentioned that this Fairy team has a high victory rate against Fire as well. Again, 50-60%. Considering that other Fairy teams (including my own other Fairy teams) tend to be disadvantaged against Fire, I would consider this to be an improvement. One which adds to the assessment that Magearna is too powerful.
#4: Facts.
You are certainly entitled to your opinion. But, I simply must ask how you reached this conclusion. If you consider almost a year of observation, personal experience, daily experience, low, mid, and high ladder experience repeated 29 times from start to finish, experience with multiple sets, group experience, listening to feedback from multiple outlets, and testing against some of the strongest players in the world irrelevant, what do you consider to be relevant experience? Perhaps the criteria you use could improve my ability to provide a relevant evaluation. After all, are all things in life not a summary of our experiences? And don't people see things differently because of their lack of experience. For example, you could say that 1600 Elo is extremely easy to get. And I perhaps could be persuaded to agree with such a sentiment. But how much experience is required for a primary account to get to that stage? As few as 100 battles? Or a giant number like 1,000? Which provides a better learning experience? The more experience, the more relevant an opinion becomes. After some amount of experience, that opinion purifies and solidifies into a fact, even should it be a simple one. After five thousand battles, although I would never want to assume that I know more than everybody else, I can safely say that it's a fact that Magearna - especially Weakness Policy Magearna - is exceptionally gifted to the point that it wins most match ups.
Thank you for your interest, and I hope that I've broadened your understanding of Pokémon™.
