Here is another trivia topic:
What is the two Poison type moves that Lucario can learn through TM/HMs?
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Continuing on with the story...
As they walked deeper into the forest, darkness quickly surrounded them. Fireflies started to light up and fly around all throughout the forest, lighting up the ground and the scenery faintly as they flew. However, as they got towards the shrine, a mysterious mist shrouded it, and it was so thick, that even the fireflies faint light they emitted was swallowed up by it. "Here we are at the shrine's entrance. I don't know why this fog is here, but we will have to be cautious." Celebi said, quickly examining the environment around it. "We will enter first. Riolu stay close to me." The trainer said as he slowly walked forward into the mist. Riolu was following close by him and after a minute of walking forward, saw that the mist was no longer in front of them. They were finally at the lake, and they could see the small island with the altar on it. The lake was lit up in the moonlight, fireflies and untainted wild pokemon flew around the lake. Some pokemon were drinking from the lake, and others were resting underneath the tall forest trees. The moon was directly above the lake, and naturally shined its bright moonlight upon the forest. "This lake is really beautiful... I never thought that such a lake would exist in a forest like this!" The trainer said with surprise. Riolu was also looking around, amazed at the peaceful, almost paradise-like sight. Celebi came behind them and said, "It is amazing isn't it? Well, in case your wondering, the pokemon here are protected by the power of this lake. So they were not tainted. However, I don't know how I was afflicted, but anyways. In order to cross the lake and place the stone, you must take your first step on the lake and walk forward. The bridge is invisible, but if you have a pure heart, the bridge will be revealed and you may cross to the altar." "So I just walk into the lake then?" The trainer asked. "Correct, do not worry, you will not actually be stepping on the lake, as long as you do not walk off the path." Celebi responded. "All right then." The trainer said as he walked up to the lake, took a step forward, and soon after the lake lit up, and there was a bridge that appeared in front of him. The trainer and Riolu then walked across the bridge and ended up on the small island. The trainer then took out a stone, and when he was about to place it, he was pushed back and the stone floated and the whole forest seemed to become engulfed in a strong wind, then soon after, the stone became purified, and it shined brightly in it's place. "Now that it's purified, take it and hurry back to the cave! We don't have much time until..." Celebi was interrupted by an earthquake. "No... We purified the stone... it shouldn't have started!" Celebi said again. "What was that? What's happening?" The trainer shouted. "The forest and the village is about to be attacked! Quickly! Come here!" Celebi replied, but was quickly attacked by an unseen force and fell to the ground. "Celebi!" The trainer shouted as he ran across the bridge with Riolu behind him. He went up to Celebi and it got up, only partially wounded. "Don't worry about me, I can protect the forest." Celebi responded. "But you're not fully healed yet... You can't defend the forest by yourself!" The trainer replied, but Celebi turned around and got up. "I am the guardian of this forest, it is my duty to protect it with my life. You have a task too, as Regipoison instructed you, and as a former Pokemon Ranger don't you?" Celebi said. "Wait. How did you know..." The trainer was interrupted by another earthquake. "We don't have much time! You must place the stone at the altar in the cave to resurrect the Regi trio! Here, i'll open up a side path you can take that will quickly get you out of this forest! Follow it and don't look back! I promise I will take care of everything here!" Celebi replied as faint figures of tainted pokemon with bright red eyes approached in the distance. "Don't die on me now Celebi!" The trainer said as he picked up Riolu and started running down the forest path. As he went farther down the trail Celebi provided, it closed up, leaving no trace of it whatsoever, and eventually the figure of the trainer vanished. The other pokemon who were at the lake soon approached behind Celebi to defend it, and Celebi prepared itself. "I'm sorry... I knew this would happen. I don't know if I have the strength to fully protect everyone and this forest. Please... make it to the shrine on time..." Celebi whispered as the tainted pokemon drew closer, they started charging, and the pokemon behind Celebi also charged forward as well as Celebi.
Meanwhile, the trainer got out of the forest, and he put Riolu down. They both walked up the small mountain trail and as soon as they were about to enter the cave, they heard a dragon roaring. They turned around, and in the distance, they saw the figure of a dragon pokemon attacking the town. "Were we too late? We have to keep moving!" The trainer said as he ran into the cave with Riolu.
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Yes, it was a lot to write. I'm hoping this could stay as a story topic, and we can keep expanding on it until it eventually becomes a complete story. Also, if there are any spelling or grammar mistakes, sorry. I didn't re-read this like I did with my other ones because I have some other things I have to do today and plus, it is much longer than my other story entries.