Segovax
|
Awesome Blow is on page 314 of the Bestiary. According to additional resources it is not legal for PFS.
Pathfinder Roleplaying Game: Bestiary
Animal Companions: ankylosaurus, aurochs, brachiosaurus, dire bat, dire rat, dolphin, elasmosaurus, electric eel, elephant/mastodon, frog, goblin dog, hyena, monitor lizard, moray eel, octopus, orca, pteranodon, rhinoceros, roc, squid, stegosaurus, triceratops, and tyrannosaurus; Familiars: all familiars listed on pages 131-133; Feats: none of the feats are legal for play for PCs, animal companions, or familiars unless specifically granted by another legal source; Other: all creatures in this book are legal for polymorph effects (including a druid's wild shape ability) within the boundaries of each spell or ability's parameters. All languages found in this book are available for a character to learn with the linguistics skill, except aboleth and drow sign language.
| TGMaxMaxer |
For the record, it is legal to qualify for feats based on limited time with the requirements.
There is somewhere a faq that a barbarian with a 12 str can take the power attack feat, but only use it while raging.
This would be an identical case, they can take the feat with martial flexibility provided they are enlarged, if the enlarge was dispelled they would lose the feat access.