The guard in the southern gate, Webster, has a favor to ask. Deliver his Spearow's piece of Grass Mail to the man by the pond on Route 31, and the recipient will reward you with TM44 (Rest). Return here to receive an HP Up from Webster as thanks. If you transfer the Mail to another Pokemon before delivering, you may keep the Spearow.
The Pokéathlon Dome
The northern gate's western exit leads to a short path where you meet Magnus, an old man with a Poliwrath. He is the founder of the new Pokéathlon Dome, a sports venue where Trainers can participate in the Pokéathlon, an Olympic-style competition where their three-Pokémon team competes against others. Each of the five courses—Speed, Power, Skill, Stamina, and Jump—test a Pokémon's stats with games like Hurdle Dash, Ring Drop, and Snow Throw. There are ten games in all, and any Pokémon is allowed to enter, though Pokémon with different formes will have different stat values. When you try to register for the first time, Whitney appears and gives you a jersey to wear for the competition.
The Aprijuice Stand is located to the west of the building. This shop sells a variety of pre-made Aprijuice, a performance-enhancing drink made from Apricorns, that change on a daily basis. Each of the three vending machines dispense five different drinks, each reflecting one performance stat. Noticing your Apricorn Box, the woman gives you an Apriblender. This allows you to mix your own drinks, by blending up to five Apricorns at a time. The drink is ready after walking 100 steps, and has three servings per drink.
The Athlete Shop, located at the building's far-right counter, allows competitors to exchange points for a variety of items. The available items change daily, and each item may only be purchased once per day.
The Bug-Catching Contest is free to enter, and the objective is to catch the single best Bug Pokémon possible. Trainers are given 20 Sport Balls and allowed to use a single Pokémon from their party. The others are held temporarily until the competition is over. Any Pokémon caught during the contest will be recorded by the Pokédex, though only one can be kept for judging. The competition ends when all 20 Sport Balls are used, the Trainer blacks out, leaves the park, or 20 minutes have passed. The Pokémon that was judged may be kept after the competition. A Pokémon's value is determined by its level, IVs, remaining HP, and how likely it was to appear.
Once your Pokédex has been upgraded to National Mode, you will encounter Bug Pokémon during the contest that are foreign to Hoenn and Sinnoh on Thursdays and Saturdays, while the ones primarily foreign to Johto and Kanto (excluding Scyther and Pinsir) are now limited to the Tuesday contests. Be warned as the Pokémon found during these contests are at much higher levels than the ones found before acquiring the National Pokédex. In addition the prize for first place will be one of ten evolutionary stones, chosen at random.
East of the park, that odd tree is still blocking the narrow trail from every direction. Floria, from Goldenrod's Flower Shop, suggests watering it with the SquirtBottle, which causes it to attack! It turns out to be a Sudowoodo, a Pokémon more akin to a rock than a tree.
Once the path is clear, Floria gives you the Berry Pots, a set of four handy containers that allow Berry growth while traveling. She also gives out three Oran Berries and three Pecha Berries before returning to the Flower Shop.