Ancient Cave
The Ancient Cave is a feature that is unlocked once reaching Trainerlevel 10. It allows the user to unlock quest of finding the 7 harvest sprites, summoning a Jirachi, and also resurrect fossils. It's also the place where you can solve some quests.
More quests may be released in the future!
These quests are not time limited, so you have all the time you need to find and obtain these quest Pokemon.
Harvest Sprite Quest
Seven Victini sprites were introduced as part of PokeHeroes' very first quest in September 2013.
Upon visiting the Ancient Cave page, you can see how much progress you have made in the quest. Your progress level increases as you find more harvest sprites.
Visiting the Sprites' house will give you a list of vague clues by clicking each sprite's image. If you wish to find more clues about the sprites simply click "need more hints?". This will redirect you to page giving you more detailed information. In past PokeHeroes Videos, Riako has revealed specifically how to get some of the harvest sprites! Feel free to check out our youtube channel to browse our videos.
Note: Obtaining hints any other way than listed above, (for example: asking other users) is strictly prohibited. This is considered cheating and unfair, please do not violate this rule.
The harvest sprites:
*
*
Upon finding all the harvest sprites listed above, another special Victini called "Rainbow" - the last sprite -, can be obtained, after which your quest will be officially completed!
Jirachi Quest
To obtain Jirachi you need to collect 
5 Star Pieces before you are able to summon it in the Ancient Cave. Star Pieces may be obtained through Rumbling or from the Treasure Hunt game. Your 5 Star Pieces will be used when summoning Jirachi.
It is important to keep an empty space in your party to obtain it, as Jirachi arrives in its egg form.
Note: You can also choose other things to use your star pieces on, only one option will give you a Jirachi egg!
Raylóng Hunt
Also called "The hardest challenge on PokéHeroes". This Quest was released 22/08/14 and every step is permanent, so you may take as long as you need to complete it.
The legendary Pokémon, Raylóng is part of a huge myth that is certainly popular in Emera Town. It is said, that only trainers who collect all 7 Jade Orbs, will be honored by the presence of the ancient green dragon. The Jade Orbs are hidden carefully in the whole town - and you can only find them after clearing very difficult quests. After you have obtained the Jade Orbs, you can summon a Raylong in the Ancient Cave. The Raylong comes in it's egg form, so you must also have an open party space beforehand.
You are able to complete this quest multiple times.
Giratina
This Quest was release on the Halloween Event 2014 where you have been able to get a 
Griseous Orb for 7,500 
Halloween Sweets for the first time on PokéHeroes.
After you have the summoning item in your possession you can start the Quest. You will be asked to place the Griseous Orb into a small notch in the wall so the Quest can start.
After you finished the Giratina minigame you will get a .png){kind=small}
Spooky Manor (Map) to move on to the next part on getting a Giratina. Finally with the 
Dark Orb you will be able to summon Giratina at the Ancient Cave and get a Giratina Egg.
You are able to complete this quest multiple times.
The Weather Trio
Rayquaza, Groudon & Kyogre can be summoned in the Ancient cave only if you have an Emerald, Ruby or Sapphire. Rubies/Sapphires/Emeralds can be obtained if you have got a Terra Map, a Sky Map or a Marine Map. These special rumble mission maps can be found rarely in Mystery Boxes. Each map will unlock a special area.
→ Marine Cave (Marine Map)
→ Terra Cave (Terra Map)
→ Sky Pillar (Sky Map)
You can send your Pokemon out to explore these special areas, but be aware that it may take them days to find something. However, each area also has special requirements; for example...
- The Sky Pillar can only be explored by a Flying type Pokémon.
- The Terra Cave can only be explored by Ground or Fire type Pokemon
- The Marine Cave can only be explored by Water type Pokemon.
Double type Pokemon also work. For example... You can send a Normal/Flying Pokemon to explore the Sky Pillar - You can send a Fire/Ground type Pokemon to explore the Terra Cave and so on.
Consider to get your Pokémon on a very high level before sending them on such a mission - they may be challenged by very strong Boss-Pokémon.
Your Pokemon will fight Rayquaza in the Sky Pillar. If your Pokemon wins, it will return from the mission with an Emerald which you can use to summon Rayquaza in the Ancient Cave
Your Pokemon will fight Groudon in the Terra Cave. If your Pokemon wins, it will return from the mission with a Ruby which you can use to summon Groudon in the Ancient Cave
Your Pokemon will fight Kyogre in the Marine Cave. If your Pokemon wins, it will return from the mission with a Sapphire which you can use to summon Kyogre in the Ancient Cave
If your Pokemon loses the battle, it will return from the mission with the map. You may reuse the map as many times as you like until your Pokemon finally succeeds. If you do manage to defeat the legendary Pokemon, your map will disappear.
The Egg will be placed directly into your party, so you need a free placed before summoning it, and hatching these eggs will also break your shiny chain!
Unown
This quest is pretty simple. The only thing you have to do is have all the Unown EggDexes and PokéDexes. As seen in the image on your right you can always keep track of what letter you are missing at the Ancient Cave. And once you have completed this quest you will be rewarded with a secret gift!
Fossils
On the front page of the ancient cave you may find a section that allows you revive any fossils you may have in your possession. Simply press "Summon" and the egg will be placed in your party.
The pokemon you obtain corresponds to the fossil name.
Please note that these Pokemon will break your shiny chain.