FlyingFlying is an evasion ability.
A creature with flying can’t be blocked except by creatures with flying and/or reach. A creature with flying can block a creature with or without flying. (See rule 509, “Declare Blockers Step,” and rule 702.17, “Reach.”)
Multiple instances of flying on the same creature are redundant. (CR 702.9)
Other Alicorns, Horses, Pegasi, Ponies, and Unicorns you control get +1/+1.
: If you control Applejack, Fluttershy, Pinkie Pie, Rainbow
DashDash represents three abilities: two static abilities that function while the card with dash is on the stack, one of which may create a delayed triggered ability, and a static ability that functions while the object with dash is on the battlefield. “Dash [cost]” means “You may cast this card by paying [cost] rather than its mana cost,” “If this spell’s dash cost was paid, return the permanent this spell becomes to its owner’s hand at the beginning of the next end step,” and “As long as this permanent’s dash cost was paid, it has haste.” Casting a spell for its dash cost follows the rules for paying alternative costs in rules 601.2b and 601.2f–h. (CR 702.109), and Rarity, everypony wins the game.