What does that mean in non pokemon fan terms
You know how moves have set "powers", like how Earthquake has 100 listed and Icy Wind 55? Well, back in the DS and earlier days, Ice Beam, Thunderbolt, Flamethrower and Surf all had 95 "power"; Fire Blast, Blizzard, Thunder, Hydro Pump and Hurricane had 120; Overheat, Draco Meteor and Leaf Storm had 140.
When the series moved onto the 3DS, for whatever reason Game Freak decided to weaken these moves - so now the moves that previously had 95 "power" have it dropped to 90; 120 was reduced to 110; 140 was lowered to 130. There was no reason for this, since no-one ever complained about these moves being "too overpowered" or anything - another major nerf that happened in XY was Drought, Drizzle, Snow Warning and Sand Stream being reduced to producing 5 turns of their respective weather (just like the moves Sunny Day, Rain Dance, Hail and Sandstorm), due to weather being overly centralising back in Gen V.
The weather nerf made sense; the other nerfs, the ones I listed, never did. Sure, Gale Wings Talonflame was a beast in XY and ORAS, but because he didn't get a Fighting-type move, he was stopped cold by Rock-types; Aegislash was quite powerful on the 3DS, but King's Shield doesn't block against Will-O-Wisp, doesn't lower Sp. Atk (so it just nulls any damage done by special moves, without punishing the attacker), and if the spirit blade was hit in its Blade form it went down real easy. Steel never should have lost two major resistances, especially when Knock Off got such a major buff; this makes all the Steel/Psychic and Steel/Ghost types weak to Dark and Ghost, unexpectedly weakening fan favourites like Metagross and Jirachi (and Bronzong, who was previously known for only having one weakness, due to its Ability choice - Levitate negating Ground, or Heatproof weakening Fire).
Sword/Shield added more counters against Terrain users, so why weaken Terrain buffs?
Nerfing stuff just upsets people; what makes them excited is adding things that counter them, so they can still be fully used as originally designed, yet can be played around too if you know how and are prepared for it.
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