I've remember Ash's six officially owned Pokémon: Pidgeot, Charizard, Heracross, Beedrill (now Casey's), Sceptile and Glalie, the ones that had never actually Mega Evolved for the first time despite their capability of Mega Evolutions.
Ash had caught Pidgeotto in the Kanto region, much to Misty warning him in her anger that it would consume his Caterpie. However, once Ash's Caterpie had evolved into Metapod, this prevented his Pidgeotto from consuming it. Right after his loss to the quarterfinals to Ritchie at the Indigo Conference, Ash's Pidgeotto later had fully-evolved into Pidgeot that he had released back into the wild, so that it could protect a flock of Spearow from the danger of Fearow, the one that Ash encounter as originally Spearow during the start of his journey in the Kanto region, although Ash had never Mega Evolved it into Mega Pidgeot for the first time.
Ash also had caught Charmander in the Kanto region, the one that its former Pokémon Trainer Damien had abandoned. Ash's Charmander had middle-evolved into Charmeleon that had become disobedient, and it later fully-evolved into Charizard that had remained disobedient until Ash had convinced it to become obedient to which it agreed. Ash had left Charizard at the Charific Valley, until it later rejoined Ash's Unovan party, and Ash left it at Professor Oak's Laboratory, although he had never Mega Evolved it into Mega Charizard X or Y in the XY anime series.
Ash had caught Heracross in the Johto region, and Ash left it at Professor Oak's Laboratory, although he had never Mega Evolved it into Mega Heracross for the first time.
Ash also had caught Beedrill at the Bug-Catching Contest in the Johto region. He had given it away to its new Trainer Casey instead in order to keep it in the party with her, although Ash and Casey had never Mega Evolved it into Mega Beedrill for the first time.
Ash had caught Treecko in the Hoenn region. Ash's Treecko had later middle-evolved into Grovyle. Later in the Kanto region, Ash's Grovyle fully-evolved into Sceptile. Ash had left it at Professor Oak's Laboratory, although he had never Mega Evolved it into Mega Sceptile for the first time.
Ash also had caught Snorunt in the Hoenn region. Ash's Snorunt fully-evolved into Glalie. Ash had left Glalie at Professor Oak's Laboratory, although he had never Mega Evolved it into Mega Glalie for the first time.
So, unless they have later changed their mind, why do you think that the Pokémon main anime staff writers have decided to not let Ash Mega Evolve any of his Pokémon, whether Charizard, Heracross, Sceptile and/or Glalie, for the first time at all? Do you think that they'll bring any of them out from Professor Oak's Laboratory to Mega Evolve them in the Alola Conference or later in the Sword and Shield anime series, or never, since Brock and Misty are the only two former main character to Mega Evolve Steelix and Gyarados into Mega Steelix and Gyarados, respectively? Please let me know, thanks. 
Certainly! The passage you provided dives deep into Ash's Pokémon journey, particularly focusing on his captured Pokémon and their evolutionary paths. Let's break down the concepts mentioned:
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Ash's Pokémon:
- Pidgeot: Evolved from Pidgeotto and then released to protect a flock of Spearow.
- Charizard: Evolved from Charmander, became disobedient, later left at Charific Valley, and eventually rejoined Ash.
- Heracross: Captured in Johto and left at Professor Oak's Lab.
- Beedrill: Caught in a Bug-Catching Contest and given to Casey.
- Sceptile: Evolved from Treecko and left at Professor Oak's Lab.
- Glalie: Evolved from Snorunt and also left at Professor Oak's Lab.
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Mega Evolution:
- Despite the capability of Mega Evolution, none of Ash's Pokémon mentioned—Charizard, Heracross, Sceptile, or Glalie—have undergone this transformation in the anime.
- There's a speculation on why the writers might have chosen not to show Mega Evolution for Ash's Pokémon.
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Mega Evolution in the Anime:
- The discussion revolves around whether the main anime staff writers will allow Ash's Pokémon to Mega Evolve in future arcs, specifically questioning if it might occur during the Alola Conference or in the Sword and Shield anime series.
- There's a comparison made with Brock and Misty, former main characters who Mega Evolved their Pokémon, Steelix and Gyarados, respectively.
Regarding the absence of Mega Evolution for Ash's Pokémon, there can be several reasons. The anime writers may have opted to focus on other aspects of Ash's journey, the dynamics between Pokémon and Trainer, or simply chosen to reserve Mega Evolution as a special element for specific narrative arcs. It's uncertain whether they'll revisit Mega Evolution for Ash's Pokémon in future episodes or series.
The writers often aim to surprise and engage the audience, so while past patterns might hint at certain outcomes, they're not definitive. The decisions around Mega Evolution in the anime depend heavily on storytelling choices and the narrative direction the creators wish to pursue.
