Abandoned warehouse

The abandoned warehouse is a location that Gunner keeps her Captured Fighters in, Later in Chapter 20 Shulk Saved Lucario, Greninja and his friend Cloud

Coverage
Chapter 3

When Gunner knocked out Lucario, she taken him to the abandoned warehouse and there was chairs and a table ,then Gunner Tied lucario up on one of the chairs and left here until she kidnaps another Fighter

Chapter 7

Gunner now kidnapped Greninja and he was heavy to pull and when she got to the warehouse, Lucario Realise he was kidnapped all along, he was mad when Gunner captured Greninja and Tied him before propping him onto a chair and explained why she started to kill fighters

Chapter 12

Cloud was chasing after Gunner until she uses a beam to smack him,casing him to fell unconscious, Gunner knows that Cloud is stronger than Lucario and greninja so ropes was not the best idea so she pulled cloud (who is lighter) to the abandoned warehouse and chained his arms and legs to a wall of the dark side of the warehouse

Chapter 20

Shulk then ran to the warehouse with Cloud's Buster sword (which was left when cloud was kidnapped by gunner) and broken into the abandoned warehouse, Lucario thoughts it was gunner but it was shulk so he can free them and Cloud saw him and shulk freed him from his chains and left the warehouse

Trivia

 * Cloud was the only human fighter to get kidnapped by gunner and the only fighter chained rather than tied in rope
 * In smash bros one-shots, Cloud was kidnapped the exact same way but sephiroth kidnapped him this time
 * This is possible how Gunner kidnaps them but she usually hit them with something and to prevent them from other Fighters, Lucario was Hit by a rock Gunner founded in the forest, Greninja had his legs injured and fell down and got knocked out by a twig and Cloud was the final fighter to get Kidnapped and he was fighting gunner and was smacked by Gunner's Blaster.
 * When Gunner hidden Cloud away, his sword was left out so he won't escape