248 HP / 252 Def / 8 SpD Impish should be the main spread for RestTalk because Gyara needs all the bulk it can get to be a reliable physical wall. It says in the analysis that the extra special defense allows it to live Life Orb Landorus' Sheer Force Psychic after Stealth Rock, but Gyara can comfortably do that even with 248 HP and 8 Special Defense:
252+ SpA Modest Life Orb Sheer Force Landorus Psychic vs. 248 HP / 8 SpD Gyarados: 166-196 (42.23 - 49.87%) -- guaranteed 3HKO
252 SpA Timid Life Orb Sheer Force Landorus Psychic vs. 248 HP / 8 SpD Gyarados: 151-178 (38.42 - 45.29%) -- guaranteed 3HKO
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