None of Ash's Pokemon have Horn Leech and only one has Leaf Blade.
Skiddo doesnt necessarily have to have Razor Leaf and Vine Whip in it's final moveset, you know.
Regarding
Leaf Blade, did you forget
Snivy or was it
Sceptile.
While its true that none of
Ash's Pokemon know
Horn Leech, but it was obvious since it was only released last gen and was exclusive to only
Sawsbuck (which
Ash didn't get).
As for
Razor Leaf and
Vine Whip,
Well
Razor Leaf or its variants (like
Leaf Storm) have been a standard on
Ash's team.
Bulbasaur,
Bayleef and
Leavanny know this move, while
Sceptile (while dropping either Bullet Seed or Solar Beam),
Torterra and
Snivy know
Leaf Storm.
As for
Vine Whip, it has been an all purpose move in the anime and is known by
Ash's
Bulbasaur,
Bayleef and
Snivy.
But since
Clemont's
Chespin already knows this move, the chances are low for
Ash's Pokemon to also know/learn it this time (since the writers have been trying to avoid having same moves in the group for some time as long as it isn't
Dig).
Truthfully, if
Ash gets a
Skiddo/
Gogoat, i can see it having
Razor Leaf and
Leaf Blade on it. And since the writers like flashy spherical type attacks it could also know
Energy Ball for that matter.
The only different type move i can see it having is
Take Down/
Double-Edge and possibly
Aerial Ace if it evolves.
The reason why i believe this could happen is because
Ash's Grass type rare have diverse move-sets and most of the time end up with a Grass-Normal type move-set with the exception of
Leavanny who had Bug type moves
(thanks to its being part Bug type, but sadly it learned damaging Bug type very late, just like Pignite learned Fighting type move pretty late).
Its not like Ash's Grass type could learn good moves, during the 3rd and 4th Gen
Sceptile had access to some pretty good Dragon, Bug and Fighting type moves, while
Torterra had access to Rock type moves and even had the anime usable Ground type move
Sand Tomb. Meanwhile Snivy had Twister and Leavanny had access to moves like Shadow Claw and Air Slash. But none of those moves made the final cut.
Similarly,
Skiddo/
Gogoat have some good moves as well in the form of
Surf,
Wild Charge,
Rock Slide and
Bulldoze. But i doubt the would make it to the final cut.
This is the reason why i want
Ash to get a
Phantump because it would force the writers to give it a diverse move-set (since it part Ghost type) and has only access to one standard move i.e.,
Energy Ball.
But like you said,
Skiddo/
Gogoat could have a different set. But the problem is i can't see it have nothing but Grass and Normal type moves (like most of the other Grass type that
Ash had until now)