They're really just referring to competitive battles; more specifically Stealth Rock. Because apparently every pokemon in existence can learn it and its the most devastating attack in the history of ever.
Playing) Fire Emblem: Awakening, Guild Wars 2 Waiting) Pokemon XY
If Game Freak does just one thing next gen, I want them to nerf Stealth Rock. Change it to a multi turn setup like Spikes and Toxic Spikes, add more "Rapid Spin" type moves and users, anything would be good. Some medium-to-weak existing moves could conceivably remove hazards... Whirlpool, Whirlwind, Icy Wind, Razor Wind, Sliver Wind, Twister. Game Freak has a lot of options, but for some reason I think they'll just add a new entry hazard, like "Fairy Dust" or something.
Charizard definitely needs a good +SpE or +SpA/+SpE move, I.E quiver dance, or a new equivalent.
Stealth Rock, Rock Slide, and Stone Edge availability, especially on faster pokes, doesn't help charizard. I imagine Protect/Overheat/Air Slash/Dragon Pulse Zard could work in doubles with Tailwind or Trickroom support, but he still has mediocre SpA and SpE compared to other run-of-the-mill fire types, such as Magmar and Moltres.
TBH, as much as I love fire types..I usually use them in doubles where I can couple them with an adequate partner to cover their weaknesses...but Doubles and Triples are an altogether different competitive scene compared to singles in some senses.
Charizard's defenses aren't bad, they are actually pretty good for a sweeper that's not legendary, no other fire starter but Typhlosion has better defenses.
Fire/Flying isn't a bad typing, it's actually pretty average. It only has 3 weaknesses, earthquake, spikes, and toxic spikes immunity, TWO 4x resistances, resistance to three different priority moves, and fighting resistances.
The problem is that solar power makes even resisted hits hurt badly.
Charizard's not a wall or anything, but people are pretty ignorant of its defensive decency.
Not changing this sig until we get a new main series Tales game released on a Nintendo console in the US Dictator of the Zelda Wii U Board