Well you don't actually need to chain breed to get a Squirtle that knows both Dragon Pulse and Aura Sphere because Clawitzer can learn both moves and is henceforth the only Pokémon that can breed with Squirtle (or one of Squirtle's Evolutionary Line) to get a Squirtle with both Dragon Pulse and Aura Sphere.
It's actually pretty simple to do but I'll put it into steps so it's easier to understand:
Step 1: Get a Clawitzer and teach it both Dragon Pulse and Aura Sphere.
Note: The fastest way to teach Clawitzer Dragon Pulse and Aura Sphere is to go to the Move Relearner in Dendemille Town. Once there she will teach your Clawitzer Dragon Pulse and Aura Sphere for two Heart Scales respectively.
Step 2: Put Clawitzer and Squirtle (or one of Squirtle's Evolutionary Line) in the Day Care Centre.
Step 3: Run around for a couple of minutes then go back to the Day Care Centre to get your egg from the Day Care Man.
Step 4: Run around again until the egg you recieved from the Day Care Man hatches. Once the egg hatches you should have a Squirtle with both Dragon Pulse and Aura Sphere.
Hope I helped :)