Please, stop saying that it will.
Lanturn is a stage one, which needs 3 energies to attack.
Donphan is a stage one, which needs 1 energy to attack.
Reshiram is a basic, which needs 3 energies to attack.
If you get a Lanturn out, and KO a donphan with 3 energy, they will send up a donphan and kill you with one energy.
If you get a Lanturn out and KO a Reshiram, they will bring out another reshiram, inferno fandango to it, and OHKO lanturn. Or, they will bring out Emboar, who can also OHKO lanturn, but isn't always ohko'd by lanturn.
In addition, Lanturn needs a lightning energy. If you don't have lightning energy in your deck, it will be almost impossible to pull out a single lightning energy out of 2-3 that you tech in. If you use an electric deck already, then you may as well just use the upcoming Tornadus (edit: Not thunderus), who has resistance to fighting.
In addition: People keep saying Xatu counters Donchamp. I disagree. If people start teching for machamp, machamp can start teching to beat Xatu. Boldore from B/W can 2hko Xatu with only a fighting and a colorless, and then machamp prime can go ahead and fighting tag those energy so they aren't wasted; for example.
Gantle (Boldore) – Fighting – HP90
Stage 1 – Evolves from Dangoro
[F][C] Shoot Down: 20 damage. If the opponent’s Active Pokemon has a Resistance to the Fighting-type, this attack does an additional 60 damage.
[F][F][C][C] Power Gem: 80 damage.
Weakness: Grass (x2)
Ressitance: none
Retreat: 3
In the next set, we should get this Sigilyph:
Symbolar – Psychic – HP90
Basic Pokemon
[P] Reflect: During your opponent’s next turn, any damage done to this Pokemon by attacks is reduced by 40.
[P][C][C] Telekinesis: Choose 1 of your opponent’s Pokemon and do 50 damage to that Pokemon. This attack’s damage isn’t affected by Weakness or Resistance.
Weakness: Lightning (x2)
Resistance: Fighting (-20)
Retreat: 1
Which should help counter donphan, though; if you run psychic energy...
Note: Using Feraligatr won't let you counter Zekrom either. If you attach 4 energy to Feraligatr, they can simply let zekrom die, then outrage for 20, then bolt strike again for a KO. Or, just keep using outrage, because you can't kill it without letting it's damage build up. It needs 4 damage counters on it to be a KO, so if they play defender (Which I think Zekrom will - defender doesn't? reduce the damage done to himself) it will also be not good for you.)
Lanturn is a stage one, which needs 3 energies to attack.
Donphan is a stage one, which needs 1 energy to attack.
Reshiram is a basic, which needs 3 energies to attack.
If you get a Lanturn out, and KO a donphan with 3 energy, they will send up a donphan and kill you with one energy.
If you get a Lanturn out and KO a Reshiram, they will bring out another reshiram, inferno fandango to it, and OHKO lanturn. Or, they will bring out Emboar, who can also OHKO lanturn, but isn't always ohko'd by lanturn.
In addition, Lanturn needs a lightning energy. If you don't have lightning energy in your deck, it will be almost impossible to pull out a single lightning energy out of 2-3 that you tech in. If you use an electric deck already, then you may as well just use the upcoming Tornadus (edit: Not thunderus), who has resistance to fighting.
In addition: People keep saying Xatu counters Donchamp. I disagree. If people start teching for machamp, machamp can start teching to beat Xatu. Boldore from B/W can 2hko Xatu with only a fighting and a colorless, and then machamp prime can go ahead and fighting tag those energy so they aren't wasted; for example.
Gantle (Boldore) – Fighting – HP90
Stage 1 – Evolves from Dangoro
[F][C] Shoot Down: 20 damage. If the opponent’s Active Pokemon has a Resistance to the Fighting-type, this attack does an additional 60 damage.
[F][F][C][C] Power Gem: 80 damage.
Weakness: Grass (x2)
Ressitance: none
Retreat: 3
In the next set, we should get this Sigilyph:
Symbolar – Psychic – HP90
Basic Pokemon
[P] Reflect: During your opponent’s next turn, any damage done to this Pokemon by attacks is reduced by 40.
[P][C][C] Telekinesis: Choose 1 of your opponent’s Pokemon and do 50 damage to that Pokemon. This attack’s damage isn’t affected by Weakness or Resistance.
Weakness: Lightning (x2)
Resistance: Fighting (-20)
Retreat: 1
Which should help counter donphan, though; if you run psychic energy...
Note: Using Feraligatr won't let you counter Zekrom either. If you attach 4 energy to Feraligatr, they can simply let zekrom die, then outrage for 20, then bolt strike again for a KO. Or, just keep using outrage, because you can't kill it without letting it's damage build up. It needs 4 damage counters on it to be a KO, so if they play defender (Which I think Zekrom will - defender doesn't? reduce the damage done to himself) it will also be not good for you.)