(I presume Regenerator doesn't do anything because Neutralizing Gas was active when Astrolotl switched out, someone correct me if I'm wrong on this)
Step 1
Flambé used Dragon Claw! (-6 EN, 73 left)
Roll to Crit (1/24 = Crit): 19/24 = No Crit
(8 + 3 + 2) = 13 damage (40 HP left)
Pebbles used Rock Slide! (-6 EN, 76 left)
Roll to Hit (10/10 = Miss): 9/10 = Hit!
Roll to Crit (1/24 = Crit): 1/24 = Crit!
(8 + 3 + 3 + 3 + 3) * 1.5 = 30 damage (23 HP left)
Pebbles was hurt by its Life Orb! (-3 HP, 37 left)
Step 2
Flambé used Dragon Claw! (-6 EN, 67 left)
Roll to Crit (1/24 = Crit): 10/24 = No Crit
(8 + 3 + 2) = 13 damage (24 HP left)
Pebbles used Rock Slide! (-6 EN, 70 left)
Roll to Hit (10/10 = Miss): 3/10 = Hit!
Roll to Crit (1/24 = Crit): 19/24 = No Crit
(8 + 3 + 3 + 3) * 1.5 = 25.5 round to 26 damage (-3 HP left)
Flambé was KO'ed!
Pebbles was hurt by its Life Orb! (-3 HP, 21 left)