Alright, just more 99 pages to get to the 300 pages, let's keep it up
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About his moveset, I think Isaac should be strong and fast, like in the games where he has one of the highest attack stats and the fourth highest Agility, so comparing to other fighters, he would be almost as strong as Ike in swordplay and almost as fast as Marth/Lucina. Also, he won't have that much of a delay after using an attack like Ike.
He would be good on the ground and would still have a good air game, where his side and backward attacks could be slashs with his sword, while his up-air could be Force-Psyenergy and his Down air could be Spire (it would pack a meteor smash). His standard air could be a circle of stones floating around him.
His dash attack could be Quick Strike (he vanishes and reappears with a powerful strike) and his Smash attacks could be Flint (Side Smash, also, if the opponent gets hit by Flint who is in the tip of the sword, the damage and knockback will be higher), Quake Sphere (Down Smash, would work like Megaman's down smash) and Wild Growth (Up smash, would work like Palutena's Up Smash, but won't have as much range and will be more damaging).
His Special attacks could be: Standard- Ragnarok (a blade quickly falls from the sky in front of Isaac, rechargeable); Side - Move (deals no damage); Up- Retreat (deals no damage); Down - Gaia (rechargeable and the more you recharge, it could evolve into Mother Gaia and Grand Gaia, becoming more powerful and having more wide range).
As for Isaac's final smash, it could be Odyssey (if the first swords pierces the opponent, then another sword would pierce and a huge colossal blade would finish the attack) or it could be Judgement (Isaac dissapears from the battlefield and the winged knight stops above it and releases a huge energy blast that constantly damages and pulls anyone in, after 5 seconds, it would explode for massive damage).
This are just ideas from the moveset that I made for Isaac that is lost somewhere on this thread.
Isaac for SSB4 (and luckily we get GS4 too, the power of 4).