The second (after Squirtle) turtle pokemon that Ash has trained in his long history. He is quite emotional in nature, often crying, or blowing smoke out of his nostrils, or doing both. At one point, like most of his Pokemon, Ash before journey to a new region, left him in the care of Professor Oak.
Below is a list of the episodes in which this Pokemon appears – the first number is the overall episode number, the second is the episode number within the sub-series, AG is Advanced Generation, DP is Diamond & Pearl, PK is a special episode (focusing on Pikachu). Episode numbers according to the Bulbapedia.
332 – AG058 – All Torkoal, No Play – Debut
333 – AG059 – Manectric Charge
334 – AG060 – Delcatty Got Your Tongue
338 – AG064 – True Blue Swablu – Small part.
340 – AG066 – Exploud and Clear! – Small part.
341 – AG067 – Go Go Ludicolo!
342 – AG068 – A Double Dilemma – Small part.
344 – AG070 – Balance of Power
353 – AG079 – Pearls are a Spoink’s Best Friend
356 – AG082 – A Shroomish Skirmish – Small part.
357 – AG083 – Unfair Weather Friends
358 – AG084 – Who’s Flying Now? – Small part.
360 – AG086 – Lights, Camerupt, Action!
361 – AG087 – Crazy as a Lunatone – Small part.
362 – AG088 – The Garden of Eatin’ – Small part.
367 – AG093 – Clamperl of Wisdom
373 – AG099 – It’s Still Rocket Roll to Me! – Small part.
375 – AG101 – Vanity Affair
379 – AG105 – Once in a Mawile
381 – AG107 – Absol-ute Disaster
382 – AG108 – Let it Snow, Let it Snow, Let it Snorunt! – Small part.
391 – AG117 – Berry, Berry Interesting
392 – AG118 – Less is Morrison
396 – AG122 – Deceit and Assist
398 – AG124 – Island Time – Torkoal
400 – AG126 – Saved by the Beldum
401 – AG127 – From Brags to Riches
402 – AG128 – Shocks and Bonds
404 – AG130 – Choose It or Lose It!
405 – AG131 – At the End of the Fray
407 – AG133 – The Right Place and the Right Mime – Small part. In this episode May’s Squirtle debut.
460 – AG186 – Overjoyed!
648 – DP182 – An Old Family Blend!
655 – DP189 – The Semi-Final Frontier!
1199 – JN114 – Friends, Rivals, Lend Me Your Spirit! – Ash’s Torkoal and Torterra appears, also in flashback as Turtwig.
1203 – JN118 – Battling as Hard as Stone! – Ash’s Torkoal and Torterra appears.
1208 – JN123 – Bewitch, Battle, and Bewilder! – Ash’s Torkoal appears.
1209 – JN124 – Valor: A Strategic Part of Battling! – Ash’s Torkoal and Torterra appears.
1210 – JN125 – Whittle While You Work! – Ash’s Torkoal appears.
1215 – JN130 – Toying With Your Motions! – Ash’s Torkoal appears.
1216 – JN131 – Paring Pokémon While Parrying! – Ash’s Torkoal and Kiawe’s Turtonator appears.
1217 – JN132 – Partners in Time! – Ash’s Torkoal and Kiawe’s Turtonator appears in person and Ash’s Squirtle and Torterra appears in fantasy/vision.
1220 – JN135 – Heroes Unite! – Ash’s Torkoal and Torterra appears. The Squirtle he trained also appears in Ash’s thoughts.
PK13 – Pikachu’s Summer Festival – Small part.
M07 – Pokémon: Destiny Deoxys