Calling out a Grade 0 Vanguard:
In this deck, Barcgal would still be an excellent choice, because if your hand is filled with Grade 3s, and your Vanguard is Grade 1, you can Superior Ride into a Grade 2, so that you don't get stalled.
EDIT: This deck was made before Barkgal was banned from Starting Vanguard position in tournaments. If you want to find a Royal Paladin Deck that doesn't have Barkgal as Starting Vanguard, go to the Strategy II posts that I have made.
This strategy optimizes Crimson Butterfly Brigitte and Knight of the Harp, Tristan with 10 Grade 3s in this deck. Please note that your hand will be clogged with Grade 3s, therefore if you can't perform enough damage, then you will lose the fight. Another out for this deck is using Knight of Conviction, Bors with a 7000 Power Grade 1 Booster or a 8000 Power Grade 1 Booster, because when you use the Counter Blast for it, the combined Power Level would be around 20000 to 21000, which is enough for your opponent to waste two Shields instead of 1.
With the Grade 3s clogging up the hand, you will need to conserve as much as you can, because with only a Grade 3 hand, you will receive some Damage. With 17 Grade 0 Shields (10000 Shields) and 9 Grade 1 Shields (5000 Shields), you have little room for error. With Grade 2s, you have The Knight of Truth Gordon as a 10000 Shield interceptor. Otherwise, they are 5000 Shields. Also, with Flash Shield Iseult, by discard 1 Royal Paladin, I can discard a Royal Paladin to block an attack completely without fail.
Sample Deck List:
4x Future Knight, Llew
4x Transporter of Good Luck, Epona
4x Yggdrasil Maiden Elaine
3x Little Sage Marron
3x Lake Maiden Lien
3x Flash Shield Iseult
3x Starlight Unicorn
2x Blaster Blade
3x Knight of the Harp, Tristan
3x High Dog Breeder, Akane
3x Knight of Truth Gordon
3x Gigantic Charger
3x Knight of Conviction, Bors
4x Crimson Butterfly Brigitte
If you have any questions, leave a comment.