Charizard knockdown

Note:
This list assumes perfect timing when hitting each attack meaty, otherwise the aerials can also get beaten out by every character's 8Y in addition.
? - needs testing
* - needs confirmation

Optimal followups
On hit:
jX - 2X, 8A
jA - none
jY - 2X, 8A
5Y - j6YY, 2X, 8A

On block:
jX - 5Y
jA - none
jY - 2Y
5Y - j6Y

On counter:
jX (pierce) - 2X, 8A
jA - none
jY - jA
5Y - jA

Ultra safe (3)
Can pressure with any option on wakeup

Charizard
jY - none
5Y - none
jA - none
jX - none

Machamp
jY - none
5Y - none
jA - none
jX - none

Gardevoir
jY - none
5Y - none
jA - none
jX - none

Safe (4)
Can pressure safely with at least one option that's not jX

Blaziken
jY - none
5Y - none
jA - [X+A]/8A
jX - none
- Doing jA too early risks getting caught by the end of Blaziken's X+A and doing it too late allows 8A to beat it, so it's best to use a different option.

Weavile
jY - 2X
5Y - none
jA - 2X
jX - 2X
- Yes Weavile's WAAAH does beat all of Charizard's aerials. Doesn't make a lick of sense but that's how it is. 5Y gets around it.

Garchomp
jY - 4A?
5Y - 4A?
jA - none
jX - none
- 4A no longer starts frame 1 in patch 1.3 so now it loses to meaty aerials.

Mewtwo
jY - 8A?
5Y - 8A?
jA - none
jX - none
- 4AA no longer starts frame 1 in patch 1.3 so now it loses to meaty aerials. Charizard can power through Mewtwo's 8A with jA.

Risky (5)
Requires a correct call on a 50-50 between normal and grab

Sceptile
jY - 6A
5Y - 6A
jA - 4A
jX - none
- Unlike the other characters in this group, Sceptile's counters can be beaten by normals if you guess correctly. jY beats Sceptile's 4A and jA beats Leaf Storm.

Pikachu
jY - 8A
5Y - 8A
jA - 8A
jX - none

Pikachu Libre
jY - 2A
5Y - 2A*
jA - 2A
jX - none
- Charizard's aerials can sometimes trade with 2A but it's unreliable.

Lucario
jY - 8A
5Y - 8A
jA - 8A
jX - none

Suicune
jY - X+AY
5Y - X+AY
jA - X+AY
jX - 8A
- Aurora Beam is frame 1 air-invincible so it makes jX whiff. Counter attack (DP version) beats all of Charizard's normals.

Support dependent (1)
Has a support online so frequently that it's rare to actually get to challenge it if they run a disrupt support
Braixen
jY - none
5Y - none
jA - none
jX - none
- Braixen can escape with 4X if Charizard's timing isn't flawless.

Unsafe (3)
Beats both normal and grab with the same option

Shadow Mewtwo
jY - 8A*, 5AB
5Y - 8A*, 5AB
jA - 8A, 5AB
jX - 5AB
- Teleport is frame 1 invincible which gets it out of everything on wakeup. If that wasn't enough, its 8A overpowers Charizard's jA, unlike Mewtwo's.

Gengar
jY - 8Y, backdash
5Y - backdash
jA - 8Y, backdash
jX - 8Y, backdash
- Gengar's backdash is frame 1 invincible and its 8Y is frame 1 air-invincible. Charizard cannot do anything to Gengar on wakeup reliably.

Chandelure
jY - 8Y, 8A, backdash
5Y - backdash
jA - 8Y, backdash
jX - 8Y, backdash
- Charizard's jA damages Chandelure through its 8A and then backs off just in time for it to debuff itself. It's hilarious to watch vs scrub Chandelures. Unfortunately the good Chandelures know that its 8Y and backdash have the same invincibility as Gengar's, so Charizard also cannot challenge Chandelure on wakeup.

Summary:
- 7/16 characters can be oki'd freely on wakeup: Charizard, Machamp, Gardevoir, Blaziken, Garchomp, Mewtwo, Weavile