Join a Gym? He wants to do bodyweight chest exercises. Then he can get a trainer who will put him on a bench press 1 day a week plan and take him 5 years to build a chest. Save your money.
Daily Dips and Push Ups will siffice building a chest. Its the intensity that builds it, not the gym.
5-10 sets a day of 20-25 push ups, & 5-10 sets a day of Dips will build that chest quicker than the program a gym trainer will put him on.
Either that or join the military and go to B.U.D.S for Navy Seal recruit training. you'll have a better chest than in 1 summer than the kids in the gym doing benchs and inclines once a week.
If your seroius. add weight to those dips & push ups and You'll have "shirt bustin' open" pecs