RE: ZPSL (Zekrom Lanturn Prime)
To be honest with you, this deck looks like a ZPST list with two Tornadus cut out and replaced with a 1-1 Lanturn prime line to me... If you have the cards, why not just build straight ZPST? It's already proven to be BDIF (personal opinion!) because it has nearly no autolosses, and a (about) 50/50 matchup vs anything currently in the format.
While I agree Lanturn can help against Reshiram and Donphan, don't forget they will OHKO it right back. Therefore, against a Reshiram matchup I'd rather use Lanturn to KO a Typhlosion prime (which you can drag up front with Catcher) to hamper their setup/recovery rather than KO'ing a Reshiram (which they can recover more easily, and have plenty of anyways). Against Donphan it will just be a 1 for 1 prize trade, and after that you're counting on your Tornadus' to save your day, or a poor Shaymin could be used to stall for a turn (assuming they don't drop down two Plus Power)... In either case, I think Lanturn prime has no place in this deck, as it only hampers consistency. Against Donphan you should use Tornadus to 2HKO them, while they 3HKO you. Against Reshiram you should just go for the Bolt Strike or Outrage your Zekrom provides, and you can try to outspeed them anyways.
So, for fixing your deck (assuming you're going for a ZPST deck):
Drop: (-13)
- 1-1 Lanturn Prime
- 2 Pokémon Collector
- 3 Sage's
- 3 Super Scoop Up
- 1 Switch
- 1 Energy Retrieval
- 1 Electric Energy *
Add: (+10)
+ 1 Tornadus EP
+ 1 Juniper
+ 1 Seeker
+ 2 Dual Ball
+ 1 Junk Arm
+ 3 Plus Power
+ 1 DCE*
*= just swap these two cards if you feel like it; both Zekrom and Tornadus can use DCE, and it can help with attacking and retreating. It all depends on personal preference though; if you feel 3 is enough, then probably don't put it in.
Free slots: 3
Noteworthy tecks/cards:
Assuming you're going for a ZPST deck now, here are some more cards you could add in, if you'd want of course:
+1 Bellsprout TR: This can help you greatly with the Gothitelle matchup, but your timing must be good or it could backfire against you.
+1 Rotom UD: A tech against energy heavy decks, but mainly Gothitelle as well. A smart Gothitelle player can easily play around this though!
+1 Tornadus EP: A fourth one will make your list even more consistent, and offers you more counters vs Fighting types. It's also a great starter alongside Zekrom, and makes your early game
+1 Pachirisu/Shaymin: While adding either (or both) to your deck in multiple copies, you have less risk that when they are prized/discarded/KO'ed, you will run out of resources, but on the other hand you have greater odds of starting with them (which you don't want). See what works for you!
+ 1 or 2 Seeker: Since you (probably) dropped all of your Super Scoop Ups, you require something to pick up your pokémon in another way. While Seeker helps you with this, it also uses up your Supporter choice for the turn. On the other hand it can help you with the donk, forces your opponent to pick up something as well (this can be a bonus and a hindrance at the same time!), and it doesn't require a coin flip like Super Scoop Up. See what works for you!
+ 1 Plus Power: A fourth is always handy, but maybe you have enough with 4 Junk Arm and 3 copies of Plus Power.
And a few other techs or expansions of your ''staple lines'', but see what works for you, and good luck! Feel free to PM me if you'd like to discuss your deck more in detail.