All decks shows a big weakness against energy removal or super energy removal.
Could be why even in Standard format, with pokemon requiring less energy to do heavy damage, we still do not see these cards reprinted in these forms. Everything is a coin flip or restricted in what it removes.
How can i build my deck stronger against those annoying trainers? I need another soution apart of No removal gym. No removal gym is an unfair card, there must be another solution.
I take the opposite opinion: No Removal Gym is not strong enough. Any player using SER will be prepared and willing to discard 2 cards to set you back 2 turns. If you are playing a format where (S)ER are legal, Item Finder is probably legal as well as NGR, Trash Exchange, and Time Capsule so the loss of 2 cards isn't as huge of a set back as it appears. It is equivalent to using Ultra Ball, discarding your lone supporter, then playing VS Seeker to get it back. Some Powers and attackd also make the discard beneficial, like Typhlosion's Fire Recharge or Feraligatr's Riptide. Dark Slowbro's Reel In is an option but unlikely to see play.
If the card does not outright prevent the removal, it doesn't hinder it enough. Ecogym gets you the energy back but you're still 2+ turns set back. Your options are Chaos Gym and Slowing's Power, Mind Games. Ecogym looks better if you are trying to save your Dark and Metal energy.
Besides that, you could "deal with it" by playing cards that are not hurt by removal. Options off the top pf my head:
a) Big Basic Pokemom - These are the Haymaker pokemon: Hitmonchan, Electabuzz, Magmar (Fossil), Lapras (Fossil), and Scyther (Jungle). Also Erika's Dratini even though it isn't so big. All don't need more than 2 energy cards for GOOD attacks. Hitmonchan is the exception but F for 20 is good considering so many basics have 40-50 hp. Ecogym should be preferred here because it lets you get your Rainbow energy back if removed.
b) Baby Pokemon - Elekid doesn't need energy to do 20 damage on a flip; Magby for 1 energy does 10 damage and shuts off Powers; Tyrogue for 1 energy does 30 damage on a flip. Stadium choice doesn't matter so much here.
c) 3 Pokemon in Neo Revelation have the Legendary Body Power that says Removal doesn't affect them while they are active. No Removal Gym or Chaos Gym preferred here to protect benched pokemon
d) Play Raindance - 4-1-4 Blastoise, some Lapras and Ditto. Use Ecogym. When they use Removal, Raindance the energy back into play and keep going.
e) Play Feraligatr - Energy in the discard is exactly what Feraligatr likes! They're just helping you do more damage. You still need to keep 3 water energy on it though maybe use the Totodile with Rage and have a Recall ready. So, No Removal Gym is probably the way to go here because this deck is heavy on the trainers.
f) Play KingdraCenter - Use Genetic Memory to Mud Slap all day. Use Recycle Energy so it doesn't matter if they remove it. In fact, play Pokemon Center to heal Kingdra and remove your energy yourself! (re-attach it before you attack) You don't need a stadium to protect you from removal here so you're probably playing some other stadium like Broken Ground Gym or Rocket's Minefield Gym to trap the opponent's active in place or to soften up new bench pokemon so you can target them with Mud Slap.
You could try a deck I think was called Kabulix. Use Steelix with the Onix with Rage. 2 Fighting energy, just Tackle and heal. They aren't going to OHKO you without a fire pokemon. Then, if you have enough damage, attach a Recall and Rage. If they have a fire pokemon? Kabutops (Neo Discovery) is water type. Attack a F and Slash for 20x2 or go for the Hydrocutter flip. Kabutops is weak to grass, which Steelix is resistant to, so this deck guards its weaknesses very well, has high hp pokemon that are easy to heal, and the attacks cost 1-2 energy so removal is less effective. If removal does get the better of you for a few turns, you're healing so you can take it.
Personally, I like Erika and Sabrina pokemon in to counter removal because her pokemon are low-energy. They are usually low damage but do different things. I like Erika's Gloom to Dream Dance or Vile Smell, and then discard a Recycle Energy with Celadon City Gym to remove the special condition and then do it again. Unfortunately, both Erika and Sabrina pokemon usually have low hp as well. Blaine can accelerate energy into play both with his trainer and with his Growlithe.
Sabrina's Psychic Control could give you access to your opponent's removal but I don't see that deterring them from using their own. It just enables you to possibly play more than you would normally be allowed to play.
I used Pokepedia to make sure I got all this card info correct.