As a support that is. I'm talking about a sivir who is excellent at timing her spellshield here, so stuff like morgana won't do. As far as I know, sivir has very few support counters, and all of the sivir support counters I know of are atrocious against pyke (as none of them have a basic ability root/stun, which as far as I know is a must when playing against a pyke)
As someone who plays both of them, Ali.
Siv can only shield one ability so either way gets cc'd, and if pyke engages you just knock him back out or to tower as needed.
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Personally, I go 
while my ADC goes 
, it gets rough but as long as we don't screw up and stay focused, it doesn't get too bad.
Playing Sona into Pyke is risky.
If you get hooked, you're dead.
Play something that can burst them out.
If you don't like mages, then play something that can shut down Pyke's aggression
x
could probaly handle them
Alistar hard-counters Sivir because she can't spellshield his combo, and can negate almost all aggression from Pyke.
I'd try using him, he seems perfect
Sona works against this lane if you are really careful with your positioning, since if you get caught out you're certainly dead.
Something like Alistar would be a safer pick on this in my opinion since Sivir's spellshield should only block Alistar's W - Headbutt while his Q - Pulverize and his E could land easily. He'd also be tanky enough to take most poke and trades from their team, especially given Alistar's R and his passive.
(You could even rush something like 
or 
to make your heals stronger if you needed that)
You could also go something with quite a lot of poke like Vel'Koz or Brand so long as you're careful with your positioning still. Zyra wouldn't be an awful choice here either since her plants could provide quite a bit of buffer space between you and any hooking champ.
If you really wanted to play the long game and just try to focus on CSing (not sure how great of a choice that would be against a Sivir but still) you could look toward champions that could heal for days or disengage, like Veigar (just drop a cage whenever they try to engage and you'll eventually scale up and have a ton of AP as the game goes on).
like The previous comments Said, The best support type u need in this scenario are disengagers. The more disengage potential u have the better. I would not totally toss Morgana on the bench though, a lot of sivirs are not so good with e, and u can easily negate pyke's initiations...your choice mate ^^
Heimer can't keep any turrets up against a Sivir he loses all of his pushing power. Velkoz could probably force a mediocre Pyke out of lane to get your mid laner completely destroyed as he roams the entire time and a good Sivir safe farms 1v2 because you have zero engage on her.
probably. Zap outranges boomerang and you have traps to lock down Pyke and kill him when you get a hook on him. She also has more AA range than Sivir. I'm pretty sure you move faster when you get excited than Sivir can with her ult as well.
